| Message ID | 1584446369-7021-1-git-send-email-kumarpan@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | ath11k: Adding proper validation before accessing tx_stats | expand |
Pravas Kumar Panda <kumarpan@codeaurora.org> wrote: > Before dumping tx_stats proper validation was not been taken care of. > Due to which we were encountering null pointer dereference(kernel panic). > This scenario will arise when a station is getting disconnected and > we are changing the STA state by ath11k_mac_op_sta_state and assigning > tx_stats as NULL and after this the mac80211 will destroy the > debugfs entry from where we are trying to read the stats. > > If anyone tries to dump tx_stats for that STA in between setting > tx_stats to NULL and debugfs file removal without checking the NULL > value it will run into a NULL pointer exception. > > Proceeding with the analysis of "ARM Kernel Panic". > The APSS crash happened due to OOPS on CPU 3. > Crash Signature : Unable to handle kernel NULL pointer dereference at > virtual address 00000360 > During the crash, > PC points to "ath11k_debug_htt_stats_init+0x16ac/0x1acc [ath11k]" > LR points to "ath11k_debug_htt_stats_init+0x1688/0x1acc [ath11k]". > The Backtrace obtained is as follows: > [<ffffffbffcfd8590>] ath11k_debug_htt_stats_init+0x16ac/0x1acc [ath11k] > [<ffffffc000156320>] do_loop_readv_writev+0x60/0xa4 > [<ffffffc000156a5c>] do_readv_writev+0xd8/0x19c > [<ffffffc000156b54>] vfs_readv+0x34/0x48 > [<ffffffc00017d6f4>] default_file_splice_read+0x1a8/0x2e4 > [<ffffffc00017c56c>] do_splice_to+0x78/0x98 > [<ffffffc00017c63c>] splice_direct_to_actor+0xb0/0x1a4 > [<ffffffc00017c7b4>] do_splice_direct+0x84/0xa8 > [<ffffffc000156f40>] do_sendfile+0x160/0x2a4 > [<ffffffc000157980>] SyS_sendfile64+0xb4/0xc8 > > Signed-off-by: Pravas Kumar Panda <kumarpan@codeaurora.org> > Signed-off-by: Kalle Valo <kvalo@codeaurora.org> Patch applied to ath-next branch of ath.git, thanks. fe0ebb51604f ath11k: Adding proper validation before accessing tx_stats
diff --git a/drivers/net/wireless/ath/ath11k/debugfs_sta.c b/drivers/net/wireless/ath/ath11k/debugfs_sta.c index 872f3ef..389dac2 100644 --- a/drivers/net/wireless/ath/ath11k/debugfs_sta.c +++ b/drivers/net/wireless/ath/ath11k/debugfs_sta.c @@ -219,6 +219,9 @@ static ssize_t ath11k_dbg_sta_dump_tx_stats(struct file *file, const int size = 2 * 4096; char *buf; + if (!arsta->tx_stats) + return -ENOENT; + buf = kzalloc(size, GFP_KERNEL); if (!buf) return -ENOMEM;
Before dumping tx_stats proper validation was not been taken care of. Due to which we were encountering null pointer dereference(kernel panic). This scenario will arise when a station is getting disconnected and we are changing the STA state by ath11k_mac_op_sta_state and assigning tx_stats as NULL and after this the mac80211 will destroy the debugfs entry from where we are trying to read the stats. If anyone tries to dump tx_stats for that STA in between setting tx_stats to NULL and debugfs file removal without checking the NULL value it will run into a NULL pointer exception. Proceeding with the analysis of "ARM Kernel Panic". The APSS crash happened due to OOPS on CPU 3. Crash Signature : Unable to handle kernel NULL pointer dereference at virtual address 00000360 During the crash, PC points to "ath11k_debug_htt_stats_init+0x16ac/0x1acc [ath11k]" LR points to "ath11k_debug_htt_stats_init+0x1688/0x1acc [ath11k]". The Backtrace obtained is as follows: [<ffffffbffcfd8590>] ath11k_debug_htt_stats_init+0x16ac/0x1acc [ath11k] [<ffffffc000156320>] do_loop_readv_writev+0x60/0xa4 [<ffffffc000156a5c>] do_readv_writev+0xd8/0x19c [<ffffffc000156b54>] vfs_readv+0x34/0x48 [<ffffffc00017d6f4>] default_file_splice_read+0x1a8/0x2e4 [<ffffffc00017c56c>] do_splice_to+0x78/0x98 [<ffffffc00017c63c>] splice_direct_to_actor+0xb0/0x1a4 [<ffffffc00017c7b4>] do_splice_direct+0x84/0xa8 [<ffffffc000156f40>] do_sendfile+0x160/0x2a4 [<ffffffc000157980>] SyS_sendfile64+0xb4/0xc8 Signed-off-by: Pravas Kumar Panda <kumarpan@codeaurora.org> --- drivers/net/wireless/ath/ath11k/debugfs_sta.c | 3 +++ 1 file changed, 3 insertions(+)