Bluetooth: hci_qca: Use del_timer_sync() before freeing

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_qca: Use del_timer_sync() before freeing While looking at a crash report on a timer list being corrupted, which usually happens when a timer is freed while still active. This is commonly triggered by code calling del_timer() instead of del_timer_sync() just before freeing. One possible culprit is the hci_qca driver, which does exactly that. Eric mentioned that wake_retrans_timer could be rearmed via the work queue, so also move the destruction of the work queue before del_timer_sync().

References

• https://git.kernel.org/stable/c/4989bb03342941f2b730b37dfa38bce27b543661
• https://git.kernel.org/stable/c/db03727b4bbbbb36e6ef4cb655c670eefb6448e9
• https://git.kernel.org/stable/c/37d17f63d085d601011964ade7371aeebeb6ed4b
• https://git.kernel.org/stable/c/2717654ae022e6ea959a4b7b762702fe1a4690c2
• https://git.kernel.org/stable/c/72ef98445aca568a81c2da050532500a8345ad3a