diff mbox series

[v3] Bluetooth: MGMT: Fix slab-use-after-free Read in set_powered_sync

Message ID 20241118153642.2604036-1-luiz.dentz@gmail.com (mailing list archive)
State Superseded
Headers show
Series [v3] Bluetooth: MGMT: Fix slab-use-after-free Read in set_powered_sync | expand

Checks

Context Check Description
tedd_an/pre-ci_am success Success
tedd_an/SubjectPrefix success Gitlint PASS
tedd_an/BuildKernel success BuildKernel PASS
tedd_an/CheckAllWarning success CheckAllWarning PASS
tedd_an/CheckSparse success CheckSparse PASS
tedd_an/BuildKernel32 success BuildKernel32 PASS
tedd_an/TestRunnerSetup success TestRunnerSetup PASS
tedd_an/TestRunner_l2cap-tester success TestRunner PASS
tedd_an/TestRunner_iso-tester fail TestRunner_iso-tester: WARNING: possible circular locking dependency detected
tedd_an/TestRunner_bnep-tester success TestRunner PASS
tedd_an/TestRunner_mgmt-tester fail TestRunner_mgmt-tester: Total: 492, Passed: 486 (98.8%), Failed: 2, Not Run: 4
tedd_an/TestRunner_rfcomm-tester success TestRunner PASS
tedd_an/TestRunner_sco-tester success TestRunner PASS
tedd_an/TestRunner_ioctl-tester success TestRunner PASS
tedd_an/TestRunner_mesh-tester success TestRunner PASS
tedd_an/TestRunner_smp-tester success TestRunner PASS
tedd_an/TestRunner_userchan-tester success TestRunner PASS

Commit Message

Luiz Augusto von Dentz Nov. 18, 2024, 3:36 p.m. UTC 
From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

This fixes the following crash:

==================================================================
BUG: KASAN: slab-use-after-free in set_powered_sync+0x3a/0xc0 net/bluetooth/mgmt.c:1353
Read of size 8 at addr ffff888029b4dd18 by task kworker/u9:0/54

CPU: 1 UID: 0 PID: 54 Comm: kworker/u9:0 Not tainted 6.11.0-rc6-syzkaller-01155-gf723224742fc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
Workqueue: hci0 hci_cmd_sync_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
q kasan_report+0x143/0x180 mm/kasan/report.c:601
 set_powered_sync+0x3a/0xc0 net/bluetooth/mgmt.c:1353
 hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:328
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd10 kernel/workqueue.c:3389
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 5247:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4193
 kmalloc_noprof include/linux/slab.h:681 [inline]
 kzalloc_noprof include/linux/slab.h:807 [inline]
 mgmt_pending_new+0x65/0x250 net/bluetooth/mgmt_util.c:269
 mgmt_pending_add+0x36/0x120 net/bluetooth/mgmt_util.c:296
 set_powered+0x3cd/0x5e0 net/bluetooth/mgmt.c:1394
 hci_mgmt_cmd+0xc47/0x11d0 net/bluetooth/hci_sock.c:1712
 hci_sock_sendmsg+0x7b8/0x11c0 net/bluetooth/hci_sock.c:1832
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 sock_write_iter+0x2dd/0x400 net/socket.c:1160
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa72/0xc90 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5246:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2256 [inline]
 slab_free mm/slub.c:4477 [inline]
 kfree+0x149/0x360 mm/slub.c:4598
 settings_rsp+0x2bc/0x390 net/bluetooth/mgmt.c:1443
 mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
 __mgmt_power_off+0x112/0x420 net/bluetooth/mgmt.c:9455
 hci_dev_close_sync+0x665/0x11a0 net/bluetooth/hci_sync.c:5191
 hci_dev_do_close net/bluetooth/hci_core.c:483 [inline]
 hci_dev_close+0x112/0x210 net/bluetooth/hci_core.c:508
 sock_do_ioctl+0x158/0x460 net/socket.c:1222
 sock_ioctl+0x629/0x8e0 net/socket.c:1341
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83gv
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Reported-by: syzbot+03d6270b6425df1605bf@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=03d6270b6425df1605bf
Fixes: 275f3f648702 ("Bluetooth: Fix not checking MGMT cmd pending queue")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
 net/bluetooth/mgmt.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

Comments

bluez.test.bot@gmail.com Nov. 18, 2024, 3:58 p.m. UTC | #1 
This is automated email and please do not reply to this email!

Dear submitter,

Thank you for submitting the patches to the linux bluetooth mailing list.
This is a CI test results with your patch series:
PW Link:https://patchwork.kernel.org/project/bluetooth/list/?series=910680

---Test result---

Test Summary:
CheckPatch                    PENDING   0.42 seconds
GitLint                       PENDING   0.29 seconds
SubjectPrefix                 PASS      0.07 seconds
BuildKernel                   PASS      24.75 seconds
CheckAllWarning               PASS      27.05 seconds
CheckSparse                   PASS      30.26 seconds
BuildKernel32                 PASS      24.54 seconds
TestRunnerSetup               PASS      433.25 seconds
TestRunner_l2cap-tester       PASS      22.37 seconds
TestRunner_iso-tester         FAIL      32.39 seconds
TestRunner_bnep-tester        PASS      4.79 seconds
TestRunner_mgmt-tester        FAIL      122.21 seconds
TestRunner_rfcomm-tester      PASS      7.58 seconds
TestRunner_sco-tester         PASS      11.58 seconds
TestRunner_ioctl-tester       PASS      7.97 seconds
TestRunner_mesh-tester        PASS      5.96 seconds
TestRunner_smp-tester         PASS      6.94 seconds
TestRunner_userchan-tester    PASS      5.02 seconds
IncrementalBuild              PENDING   0.99 seconds

Details
##############################
Test: CheckPatch - PENDING
Desc: Run checkpatch.pl script
Output:

##############################
Test: GitLint - PENDING
Desc: Run gitlint
Output:

##############################
Test: TestRunner_iso-tester - FAIL
Desc: Run iso-tester with test-runner
Output:
WARNING: possible circular locking dependency detected
Total: 124, Passed: 120 (96.8%), Failed: 0, Not Run: 4
##############################
Test: TestRunner_mgmt-tester - FAIL
Desc: Run mgmt-tester with test-runner
Output:
Total: 492, Passed: 486 (98.8%), Failed: 2, Not Run: 4

Failed Test Cases
LL Privacy - Start Discovery 2 (Disable RL)          Failed       0.202 seconds
LL Privacy - Set Device Flag 1 (Device Privacy)      Failed       0.153 seconds
##############################
Test: IncrementalBuild - PENDING
Desc: Incremental build with the patches in the series
Output:



---
Regards,
Linux Bluetooth
Luiz Augusto von Dentz Nov. 18, 2024, 4:04 p.m. UTC | #2 
#syz test

On Mon, Nov 18, 2024 at 10:36 AM Luiz Augusto von Dentz
<luiz.dentz@gmail.com> wrote:
>
> From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
>
> This fixes the following crash:
>
> ==================================================================
> BUG: KASAN: slab-use-after-free in set_powered_sync+0x3a/0xc0 net/bluetooth/mgmt.c:1353
> Read of size 8 at addr ffff888029b4dd18 by task kworker/u9:0/54
>
> CPU: 1 UID: 0 PID: 54 Comm: kworker/u9:0 Not tainted 6.11.0-rc6-syzkaller-01155-gf723224742fc #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
> Workqueue: hci0 hci_cmd_sync_work
> Call Trace:
>  <TASK>
>  __dump_stack lib/dump_stack.c:93 [inline]
>  dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
>  print_address_description mm/kasan/report.c:377 [inline]
>  print_report+0x169/0x550 mm/kasan/report.c:488
> q kasan_report+0x143/0x180 mm/kasan/report.c:601
>  set_powered_sync+0x3a/0xc0 net/bluetooth/mgmt.c:1353
>  hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:328
>  process_one_work kernel/workqueue.c:3231 [inline]
>  process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
>  worker_thread+0x86d/0xd10 kernel/workqueue.c:3389
>  kthread+0x2f0/0x390 kernel/kthread.c:389
>  ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
>  </TASK>
>
> Allocated by task 5247:
>  kasan_save_stack mm/kasan/common.c:47 [inline]
>  kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
>  poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
>  __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
>  kasan_kmalloc include/linux/kasan.h:211 [inline]
>  __kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4193
>  kmalloc_noprof include/linux/slab.h:681 [inline]
>  kzalloc_noprof include/linux/slab.h:807 [inline]
>  mgmt_pending_new+0x65/0x250 net/bluetooth/mgmt_util.c:269
>  mgmt_pending_add+0x36/0x120 net/bluetooth/mgmt_util.c:296
>  set_powered+0x3cd/0x5e0 net/bluetooth/mgmt.c:1394
>  hci_mgmt_cmd+0xc47/0x11d0 net/bluetooth/hci_sock.c:1712
>  hci_sock_sendmsg+0x7b8/0x11c0 net/bluetooth/hci_sock.c:1832
>  sock_sendmsg_nosec net/socket.c:730 [inline]
>  __sock_sendmsg+0x221/0x270 net/socket.c:745
>  sock_write_iter+0x2dd/0x400 net/socket.c:1160
>  new_sync_write fs/read_write.c:497 [inline]
>  vfs_write+0xa72/0xc90 fs/read_write.c:590
>  ksys_write+0x1a0/0x2c0 fs/read_write.c:643
>  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Freed by task 5246:
>  kasan_save_stack mm/kasan/common.c:47 [inline]
>  kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
>  kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
>  poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
>  __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
>  kasan_slab_free include/linux/kasan.h:184 [inline]
>  slab_free_hook mm/slub.c:2256 [inline]
>  slab_free mm/slub.c:4477 [inline]
>  kfree+0x149/0x360 mm/slub.c:4598
>  settings_rsp+0x2bc/0x390 net/bluetooth/mgmt.c:1443
>  mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
>  __mgmt_power_off+0x112/0x420 net/bluetooth/mgmt.c:9455
>  hci_dev_close_sync+0x665/0x11a0 net/bluetooth/hci_sync.c:5191
>  hci_dev_do_close net/bluetooth/hci_core.c:483 [inline]
>  hci_dev_close+0x112/0x210 net/bluetooth/hci_core.c:508
>  sock_do_ioctl+0x158/0x460 net/socket.c:1222
>  sock_ioctl+0x629/0x8e0 net/socket.c:1341
>  vfs_ioctl fs/ioctl.c:51 [inline]
>  __do_sys_ioctl fs/ioctl.c:907 [inline]
>  __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
>  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
>  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83gv
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Reported-by: syzbot+03d6270b6425df1605bf@syzkaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=03d6270b6425df1605bf
> Fixes: 275f3f648702 ("Bluetooth: Fix not checking MGMT cmd pending queue")
> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
> ---
>  net/bluetooth/mgmt.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
> index 1f6d083682b8..3ec79c69b0ee 100644
> --- a/net/bluetooth/mgmt.c
> +++ b/net/bluetooth/mgmt.c
> @@ -1351,7 +1351,13 @@ static void mgmt_set_powered_complete(struct hci_dev *hdev, void *data, int err)
>  static int set_powered_sync(struct hci_dev *hdev, void *data)
>  {
>         struct mgmt_pending_cmd *cmd = data;
> -       struct mgmt_mode *cp = cmd->param;
> +       struct mgmt_mode *cp;
> +
> +       /* Make sure cmd still outstanding. */
> +       if (cmd != pending_find(MGMT_OP_SET_POWERED, hdev))
> +               return -ECANCELED;
> +
> +       cp = cmd->param;
>
>         BT_DBG("%s", hdev->name);
>
> @@ -1432,6 +1438,11 @@ static void settings_rsp(struct mgmt_pending_cmd *cmd, void *data)
>  {
>         struct cmd_lookup *match = data;
>
> +       /* dequeue cmd_sync entries using cmd as data as that is about to be
> +        * removed/freed.
> +        */
> +       hci_cmd_sync_dequeue(match->hdev, NULL, cmd, NULL);
> +
>         send_settings_rsp(cmd->sk, cmd->opcode, match->hdev);
>
>         list_del(&cmd->list);
> --
> 2.47.0
>
syzbot Nov. 18, 2024, 4:31 p.m. UTC | #3 
Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-use-after-free Read in set_powered_sync

==================================================================
BUG: KASAN: slab-use-after-free in set_powered_sync+0x3a/0xc0 net/bluetooth/mgmt.c:1354
Read of size 8 at addr ffff888022f18818 by task kworker/u9:0/54

CPU: 1 UID: 0 PID: 54 Comm: kworker/u9:0 Not tainted 6.12.0-rc7-syzkaller-01702-gd7ef9eeef072 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Workqueue: hci0 hci_cmd_sync_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 set_powered_sync+0x3a/0xc0 net/bluetooth/mgmt.c:1354
 hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:332
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 5993:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:257 [inline]
 __kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4295
 kmalloc_noprof include/linux/slab.h:878 [inline]
 kzalloc_noprof include/linux/slab.h:1014 [inline]
 mgmt_pending_new+0x65/0x250 net/bluetooth/mgmt_util.c:269
 mgmt_pending_add+0x36/0x120 net/bluetooth/mgmt_util.c:296
 set_powered+0x3cd/0x5e0 net/bluetooth/mgmt.c:1395
 hci_mgmt_cmd+0xc47/0x11d0 net/bluetooth/hci_sock.c:1712
 hci_sock_sendmsg+0x7b8/0x11c0 net/bluetooth/hci_sock.c:1832
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:744
 sock_write_iter+0x2d7/0x3f0 net/socket.c:1165
 new_sync_write fs/read_write.c:590 [inline]
 vfs_write+0xaeb/0xd30 fs/read_write.c:683
 ksys_write+0x183/0x2b0 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5989:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:2342 [inline]
 slab_free mm/slub.c:4579 [inline]
 kfree+0x1a0/0x440 mm/slub.c:4727
 settings_rsp+0x2bc/0x390 net/bluetooth/mgmt.c:1444
 mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
 __mgmt_power_off+0x106/0x430 net/bluetooth/mgmt.c:9520
 hci_dev_close_sync+0x6c4/0x11c0 net/bluetooth/hci_sync.c:5208
 hci_dev_do_close net/bluetooth/hci_core.c:483 [inline]
 hci_dev_close+0x112/0x210 net/bluetooth/hci_core.c:508
 sock_do_ioctl+0x158/0x460 net/socket.c:1227
 sock_ioctl+0x626/0x8e0 net/socket.c:1346
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888022f18800
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 24 bytes inside of
 freed 96-byte region [ffff888022f18800, ffff888022f18860)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22f18
ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801ac41280 ffffea00009d9840 dead000000000003
raw: 0000000000000000 0000000080200020 00000001f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 58, tgid 58 (kworker/1:2), ts 69902458132, free_ts 69192164737
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556
 prep_new_page mm/page_alloc.c:1564 [inline]
 get_page_from_freelist+0x3649/0x3790 mm/page_alloc.c:3474
 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4750
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 alloc_slab_page+0x6a/0x140 mm/slub.c:2412
 allocate_slab+0x5a/0x2f0 mm/slub.c:2578
 new_slab mm/slub.c:2631 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3818
 __slab_alloc+0x58/0xa0 mm/slub.c:3908
 __slab_alloc_node mm/slub.c:3961 [inline]
 slab_alloc_node mm/slub.c:4122 [inline]
 __kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4290
 kmalloc_noprof include/linux/slab.h:878 [inline]
 dst_cow_metrics_generic+0x56/0x1c0 net/core/dst.c:185
 dst_metrics_write_ptr include/net/dst.h:133 [inline]
 dst_metric_set include/net/dst.h:194 [inline]
 icmp6_dst_alloc+0x270/0x420 net/ipv6/route.c:3288
 mld_sendpack+0x6a3/0xdb0 net/ipv6/mcast.c:1808
 mld_dad_work+0x44/0x500 net/ipv6/mcast.c:2260
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
page last free pid 25 tgid 25 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_unref_page+0xdf9/0x1140 mm/page_alloc.c:2657
 discard_slab mm/slub.c:2677 [inline]
 __put_partials+0xeb/0x130 mm/slub.c:3145
 put_cpu_partial+0x17c/0x250 mm/slub.c:3220
 __slab_free+0x2ea/0x3d0 mm/slub.c:4449
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:247 [inline]
 slab_post_alloc_hook mm/slub.c:4085 [inline]
 slab_alloc_node mm/slub.c:4134 [inline]
 kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4186
 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:668
 alloc_skb include/linux/skbuff.h:1323 [inline]
 alloc_skb_with_frags+0xc3/0x820 net/core/skbuff.c:6612
 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2881
 sock_alloc_send_skb include/net/sock.h:1797 [inline]
 mld_newpack+0x1c3/0xaf0 net/ipv6/mcast.c:1747
 add_grhead net/ipv6/mcast.c:1850 [inline]
 add_grec+0x1492/0x19a0 net/ipv6/mcast.c:1988
 mld_send_initial_cr+0x228/0x4b0 net/ipv6/mcast.c:2234
 mld_dad_work+0x44/0x500 net/ipv6/mcast.c:2260
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310

Memory state around the buggy address:
 ffff888022f18700: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
 ffff888022f18780: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888022f18800: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                            ^
 ffff888022f18880: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888022f18900: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================


Tested on:

commit:         d7ef9eee Merge branch 'am65-cpsw-rx-dscp-prio-map'
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=117bbb5f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d9e1e43bf6b46a4d
dashboard link: https://syzkaller.appspot.com/bug?extid=03d6270b6425df1605bf
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.
Luiz Augusto von Dentz Nov. 18, 2024, 5 p.m. UTC | #4 
#syz test

On Mon, Nov 18, 2024 at 11:04 AM Luiz Augusto von Dentz
<luiz.dentz@gmail.com> wrote:
>
> #syz test
>
> On Mon, Nov 18, 2024 at 10:36 AM Luiz Augusto von Dentz
> <luiz.dentz@gmail.com> wrote:
> >
> > From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
> >
> > This fixes the following crash:
> >
> > ==================================================================
> > BUG: KASAN: slab-use-after-free in set_powered_sync+0x3a/0xc0 net/bluetooth/mgmt.c:1353
> > Read of size 8 at addr ffff888029b4dd18 by task kworker/u9:0/54
> >
> > CPU: 1 UID: 0 PID: 54 Comm: kworker/u9:0 Not tainted 6.11.0-rc6-syzkaller-01155-gf723224742fc #0
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
> > Workqueue: hci0 hci_cmd_sync_work
> > Call Trace:
> >  <TASK>
> >  __dump_stack lib/dump_stack.c:93 [inline]
> >  dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119
> >  print_address_description mm/kasan/report.c:377 [inline]
> >  print_report+0x169/0x550 mm/kasan/report.c:488
> > q kasan_report+0x143/0x180 mm/kasan/report.c:601
> >  set_powered_sync+0x3a/0xc0 net/bluetooth/mgmt.c:1353
> >  hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:328
> >  process_one_work kernel/workqueue.c:3231 [inline]
> >  process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312
> >  worker_thread+0x86d/0xd10 kernel/workqueue.c:3389
> >  kthread+0x2f0/0x390 kernel/kthread.c:389
> >  ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
> >  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
> >  </TASK>
> >
> > Allocated by task 5247:
> >  kasan_save_stack mm/kasan/common.c:47 [inline]
> >  kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
> >  poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
> >  __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
> >  kasan_kmalloc include/linux/kasan.h:211 [inline]
> >  __kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4193
> >  kmalloc_noprof include/linux/slab.h:681 [inline]
> >  kzalloc_noprof include/linux/slab.h:807 [inline]
> >  mgmt_pending_new+0x65/0x250 net/bluetooth/mgmt_util.c:269
> >  mgmt_pending_add+0x36/0x120 net/bluetooth/mgmt_util.c:296
> >  set_powered+0x3cd/0x5e0 net/bluetooth/mgmt.c:1394
> >  hci_mgmt_cmd+0xc47/0x11d0 net/bluetooth/hci_sock.c:1712
> >  hci_sock_sendmsg+0x7b8/0x11c0 net/bluetooth/hci_sock.c:1832
> >  sock_sendmsg_nosec net/socket.c:730 [inline]
> >  __sock_sendmsg+0x221/0x270 net/socket.c:745
> >  sock_write_iter+0x2dd/0x400 net/socket.c:1160
> >  new_sync_write fs/read_write.c:497 [inline]
> >  vfs_write+0xa72/0xc90 fs/read_write.c:590
> >  ksys_write+0x1a0/0x2c0 fs/read_write.c:643
> >  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> >  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
> >  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >
> > Freed by task 5246:
> >  kasan_save_stack mm/kasan/common.c:47 [inline]
> >  kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
> >  kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
> >  poison_slab_object+0xe0/0x150 mm/kasan/common.c:240
> >  __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256
> >  kasan_slab_free include/linux/kasan.h:184 [inline]
> >  slab_free_hook mm/slub.c:2256 [inline]
> >  slab_free mm/slub.c:4477 [inline]
> >  kfree+0x149/0x360 mm/slub.c:4598
> >  settings_rsp+0x2bc/0x390 net/bluetooth/mgmt.c:1443
> >  mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
> >  __mgmt_power_off+0x112/0x420 net/bluetooth/mgmt.c:9455
> >  hci_dev_close_sync+0x665/0x11a0 net/bluetooth/hci_sync.c:5191
> >  hci_dev_do_close net/bluetooth/hci_core.c:483 [inline]
> >  hci_dev_close+0x112/0x210 net/bluetooth/hci_core.c:508
> >  sock_do_ioctl+0x158/0x460 net/socket.c:1222
> >  sock_ioctl+0x629/0x8e0 net/socket.c:1341
> >  vfs_ioctl fs/ioctl.c:51 [inline]
> >  __do_sys_ioctl fs/ioctl.c:907 [inline]
> >  __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893
> >  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
> >  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83gv
> >  entry_SYSCALL_64_after_hwframe+0x77/0x7f
> >
> > Reported-by: syzbot+03d6270b6425df1605bf@syzkaller.appspotmail.com
> > Closes: https://syzkaller.appspot.com/bug?extid=03d6270b6425df1605bf
> > Fixes: 275f3f648702 ("Bluetooth: Fix not checking MGMT cmd pending queue")
> > Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
> > ---
> >  net/bluetooth/mgmt.c | 13 ++++++++++++-
> >  1 file changed, 12 insertions(+), 1 deletion(-)
> >
> > diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
> > index 1f6d083682b8..3ec79c69b0ee 100644
> > --- a/net/bluetooth/mgmt.c
> > +++ b/net/bluetooth/mgmt.c
> > @@ -1351,7 +1351,13 @@ static void mgmt_set_powered_complete(struct hci_dev *hdev, void *data, int err)
> >  static int set_powered_sync(struct hci_dev *hdev, void *data)
> >  {
> >         struct mgmt_pending_cmd *cmd = data;
> > -       struct mgmt_mode *cp = cmd->param;
> > +       struct mgmt_mode *cp;
> > +
> > +       /* Make sure cmd still outstanding. */
> > +       if (cmd != pending_find(MGMT_OP_SET_POWERED, hdev))
> > +               return -ECANCELED;
> > +
> > +       cp = cmd->param;
> >
> >         BT_DBG("%s", hdev->name);
> >
> > @@ -1432,6 +1438,11 @@ static void settings_rsp(struct mgmt_pending_cmd *cmd, void *data)
> >  {
> >         struct cmd_lookup *match = data;
> >
> > +       /* dequeue cmd_sync entries using cmd as data as that is about to be
> > +        * removed/freed.
> > +        */
> > +       hci_cmd_sync_dequeue(match->hdev, NULL, cmd, NULL);
> > +
> >         send_settings_rsp(cmd->sk, cmd->opcode, match->hdev);
> >
> >         list_del(&cmd->list);
> > --
> > 2.47.0
> >
>
>
> --
> Luiz Augusto von Dentz
syzbot Nov. 18, 2024, 5:26 p.m. UTC | #5 
Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-use-after-free Read in settings_rsp

==================================================================
BUG: KASAN: slab-use-after-free in settings_rsp+0xd0/0x3c0 net/bluetooth/mgmt.c:1446
Read of size 8 at addr ffff888026bff128 by task syz.0.615/7359

CPU: 0 UID: 0 PID: 7359 Comm: syz.0.615 Not tainted 6.12.0-rc7-syzkaller-01702-gd7ef9eeef072-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 settings_rsp+0xd0/0x3c0 net/bluetooth/mgmt.c:1446
 mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
 __mgmt_power_off+0x106/0x430 net/bluetooth/mgmt.c:9531
 hci_dev_close_sync+0x6c4/0x11c0 net/bluetooth/hci_sync.c:5208
 hci_dev_do_close net/bluetooth/hci_core.c:483 [inline]
 hci_dev_close+0x112/0x210 net/bluetooth/hci_core.c:508
 sock_do_ioctl+0x158/0x460 net/socket.c:1227
 sock_ioctl+0x626/0x8e0 net/socket.c:1346
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2e757cef9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa2e8325038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa2e7736058 RCX: 00007fa2e757cef9
RDX: 0000000000000000 RSI: 00000000400448ca RDI: 0000000000000008
RBP: 00007fa2e75ef046 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fa2e7736058 R15: 00007ffd79fe2218
 </TASK>

Allocated by task 7360:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:257 [inline]
 __kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4295
 kmalloc_noprof include/linux/slab.h:878 [inline]
 kzalloc_noprof include/linux/slab.h:1014 [inline]
 mgmt_pending_new+0x65/0x250 net/bluetooth/mgmt_util.c:269
 mgmt_pending_add+0x36/0x120 net/bluetooth/mgmt_util.c:296
 set_powered+0x3cd/0x5e0 net/bluetooth/mgmt.c:1401
 hci_mgmt_cmd+0xc47/0x11d0 net/bluetooth/hci_sock.c:1712
 hci_sock_sendmsg+0x7b8/0x11c0 net/bluetooth/hci_sock.c:1832
 sock_sendmsg_nosec net/socket.c:729 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:744
 sock_write_iter+0x2d7/0x3f0 net/socket.c:1165
 new_sync_write fs/read_write.c:590 [inline]
 vfs_write+0xaeb/0xd30 fs/read_write.c:683
 ksys_write+0x183/0x2b0 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 7359:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:2342 [inline]
 slab_free mm/slub.c:4579 [inline]
 kfree+0x1a0/0x440 mm/slub.c:4727
 mgmt_set_powered_complete+0x4c5/0x6c0 net/bluetooth/mgmt.c:1348
 _hci_cmd_sync_cancel_entry net/bluetooth/hci_sync.c:645 [inline]
 hci_cmd_sync_dequeue+0x22b/0x3d0 net/bluetooth/hci_sync.c:890
 settings_rsp+0xa8/0x3c0 net/bluetooth/mgmt.c:1444
 mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
 __mgmt_power_off+0x106/0x430 net/bluetooth/mgmt.c:9531
 hci_dev_close_sync+0x6c4/0x11c0 net/bluetooth/hci_sync.c:5208
 hci_dev_do_close net/bluetooth/hci_core.c:483 [inline]
 hci_dev_close+0x112/0x210 net/bluetooth/hci_core.c:508
 sock_do_ioctl+0x158/0x460 net/socket.c:1227
 sock_ioctl+0x626/0x8e0 net/socket.c:1346
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888026bff100
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 40 bytes inside of
 freed 96-byte region [ffff888026bff100, ffff888026bff160)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26bff
ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801ac41280 ffffea0001ea6140 dead000000000003
raw: 0000000000000000 0000000080200020 00000001f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 8941535213, free_ts 7525892719
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556
 prep_new_page mm/page_alloc.c:1564 [inline]
 get_page_from_freelist+0x3649/0x3790 mm/page_alloc.c:3474
 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4750
 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265
 alloc_slab_page+0x6a/0x140 mm/slub.c:2412
 allocate_slab+0x5a/0x2f0 mm/slub.c:2578
 new_slab mm/slub.c:2631 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3818
 __slab_alloc+0x58/0xa0 mm/slub.c:3908
 __slab_alloc_node mm/slub.c:3961 [inline]
 slab_alloc_node mm/slub.c:4122 [inline]
 __kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4290
 kmalloc_noprof include/linux/slab.h:878 [inline]
 kzalloc_noprof include/linux/slab.h:1014 [inline]
 usb_hub_create_port_device+0xc8/0xc10 drivers/usb/core/port.c:743
 hub_configure drivers/usb/core/hub.c:1710 [inline]
 hub_probe+0x2503/0x3640 drivers/usb/core/hub.c:1965
 usb_probe_interface+0x645/0xbb0 drivers/usb/core/driver.c:399
 really_probe+0x2b8/0xad0 drivers/base/dd.c:658
 __driver_probe_device+0x1a2/0x390 drivers/base/dd.c:800
 driver_probe_device+0x50/0x430 drivers/base/dd.c:830
 __device_attach_driver+0x2d6/0x530 drivers/base/dd.c:958
page last free pid 8 tgid 8 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_unref_page+0xdf9/0x1140 mm/page_alloc.c:2657
 vfree+0x186/0x2e0 mm/vmalloc.c:3361
 delayed_vfree_work+0x56/0x80 mm/vmalloc.c:3282
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

Memory state around the buggy address:
 ffff888026bff000: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888026bff080: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
>ffff888026bff100: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                                  ^
 ffff888026bff180: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
 ffff888026bff200: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
==================================================================


Tested on:

commit:         d7ef9eee Merge branch 'am65-cpsw-rx-dscp-prio-map'
git tree:       net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=102db378580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d9e1e43bf6b46a4d
dashboard link: https://syzkaller.appspot.com/bug?extid=03d6270b6425df1605bf
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=15ce72e8580000
diff mbox series

Patch

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 1f6d083682b8..3ec79c69b0ee 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -1351,7 +1351,13 @@  static void mgmt_set_powered_complete(struct hci_dev *hdev, void *data, int err)
 static int set_powered_sync(struct hci_dev *hdev, void *data)
 {
 	struct mgmt_pending_cmd *cmd = data;
-	struct mgmt_mode *cp = cmd->param;
+	struct mgmt_mode *cp;
+
+	/* Make sure cmd still outstanding. */
+	if (cmd != pending_find(MGMT_OP_SET_POWERED, hdev))
+		return -ECANCELED;
+
+	cp = cmd->param;
 
 	BT_DBG("%s", hdev->name);
 
@@ -1432,6 +1438,11 @@  static void settings_rsp(struct mgmt_pending_cmd *cmd, void *data)
 {
 	struct cmd_lookup *match = data;
 
+	/* dequeue cmd_sync entries using cmd as data as that is about to be
+	 * removed/freed.
+	 */
+	hci_cmd_sync_dequeue(match->hdev, NULL, cmd, NULL);
+
 	send_settings_rsp(cmd->sk, cmd->opcode, match->hdev);
 
 	list_del(&cmd->list);