[v3,0/2] Bluetooth: btusb: Fix QCA dump packet handling and improve SKB safety

Message

En-Wei Wu Dec. 5, 2024, 7:17 a.m. UTC

This patch series fixes a NULL pointer dereference in the QCA firmware dump
handling and improves the safety of SKB buffer handling. The problem occurs
when processing firmware crash dumps from WCN7851/WCN6855 Bluetooth
controllers, where incorrect return value handling leads to premature SKB
freeing and subsequent NULL pointer dereference.

The series is split into two parts:
- Patch 1 fixes the NULL pointer dereference by correcting return value
  handling and splits dump packet detection into separate ACL and event
  functions
- Patch 2 improves SKB safety by using proper buffer access methods and
  adding state restoration on error paths

Changes in v3:
- Use skb_pull_data() for safe packet header access
- Split dump packet detection into separate ACL and event helpers

Changes in v2:
- Fixed typo in the title
- Re-flowed commit message line to fit 72 characters
- Added blank line before btusb_recv_acl_qca()

En-Wei Wu (2):
  Bluetooth: btusb: avoid NULL pointer dereference in skb_dequeue()
  Bluetooth: btusb: Improve SKB safety in QCA dump packet handling

 drivers/bluetooth/btusb.c | 120 +++++++++++++++++++++++---------------
 1 file changed, 74 insertions(+), 46 deletions(-)