diff mbox series

Bluetooth: refactor malicious adv data check

Message ID 20211124185027.395186-1-brian.gix@intel.com (mailing list archive)
State Superseded
Headers show
Series Bluetooth: refactor malicious adv data check | expand

Checks

Context Check Description
tedd_an/checkpatch fail Bluetooth: refactor malicious adv data check\CHECK:SPACING: No space is necessary after a cast #65: FILE: net/bluetooth/hci_event.c:5923: + if (ptr > (void *) skb_tail_pointer(skb) - sizeof(*ev)) { total: 0 errors, 0 warnings, 1 checks, 22 lines checked NOTE: For some of the reported defects, checkpatch may be able to mechanically convert to the typical style using --fix or --fix-inplace. /github/workspace/src/12637419.patch has style problems, please review. NOTE: Ignored message types: UNKNOWN_COMMIT_ID NOTE: If any of the errors are false positives, please report them to the maintainer, see CHECKPATCH in MAINTAINERS.
tedd_an/gitlint success Gitlint PASS
tedd_an/buildkernel success Build Kernel PASS
tedd_an/testrunnersetup success Test Runner Setup PASS
tedd_an/testrunnerl2cap-tester success Total: 40, Passed: 40 (100.0%), Failed: 0, Not Run: 0
tedd_an/testrunnerbnep-tester success Total: 1, Passed: 1 (100.0%), Failed: 0, Not Run: 0
tedd_an/testrunnermgmt-tester success Total: 493, Passed: 492 (99.8%), Failed: 0, Not Run: 1
tedd_an/testrunnerrfcomm-tester success Total: 9, Passed: 9 (100.0%), Failed: 0, Not Run: 0
tedd_an/testrunnersco-tester success Total: 12, Passed: 12 (100.0%), Failed: 0, Not Run: 0
tedd_an/testrunnersmp-tester success Total: 8, Passed: 8 (100.0%), Failed: 0, Not Run: 0
tedd_an/testrunneruserchan-tester success Total: 4, Passed: 4 (100.0%), Failed: 0, Not Run: 0

Commit Message

Brian Gix Nov. 24, 2021, 6:50 p.m. UTC 
Check for out-of-bound read was being performed at the end of while
num_reports loop, and would fill journal with false positives. Added
check to beginning of loop processing so that it doesn't get checked
after ptr has been advanced.

Signed-off-by: Brian Gix <brian.gix@intel.com>
---
 net/bluetooth/hci_event.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index efc5458b1345..7017805fb698 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -5920,6 +5920,11 @@  static void hci_le_adv_report_evt(struct hci_dev *hdev, struct sk_buff *skb)
 		struct hci_ev_le_advertising_info *ev = ptr;
 		s8 rssi;
 
+		if (ptr > (void *) skb_tail_pointer(skb) - sizeof(*ev)) {
+			bt_dev_err(hdev, "Malicious advertising data.");
+			break;
+		}
+
 		if (ev->length <= HCI_MAX_AD_LENGTH &&
 		    ev->data + ev->length <= skb_tail_pointer(skb)) {
 			rssi = ev->data[ev->length];
@@ -5931,11 +5936,6 @@  static void hci_le_adv_report_evt(struct hci_dev *hdev, struct sk_buff *skb)
 		}
 
 		ptr += sizeof(*ev) + ev->length + 1;
-
-		if (ptr > (void *) skb_tail_pointer(skb) - sizeof(*ev)) {
-			bt_dev_err(hdev, "Malicious advertising data. Stopping processing");
-			break;
-		}
 	}
 
 	hci_dev_unlock(hdev);