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(-) -- 2.43.0
