Bluetooth: Fix possible deadlock in rfcomm_sk_state_change

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: Fix possible deadlock in rfcomm_sk_state_change syzbot reports a possible deadlock in rfcomm_sk_state_change [1]. While rfcomm_sock_connect acquires the sk lock and waits for the rfcomm lock, rfcomm_sock_release could have the rfcomm lock and hit a deadlock for acquiring the sk lock. Here's a simplified flow: rfcomm_sock_connect: lock_sock(sk) rfcomm_dlc_open: rfcomm_lock() rfcomm_sock_release: rfcomm_sock_shutdown: rfcomm_lock() __rfcomm_dlc_close: rfcomm_k_state_change: lock_sock(sk) This patch drops the sk lock before calling rfcomm_dlc_open to avoid the possible deadlock and holds sk's reference count to prevent use-after-free after rfcomm_dlc_open completes.

References

• https://git.kernel.org/stable/c/98aec50ff7f60cc6f2d6a4396b475c547e58b04d
• https://git.kernel.org/stable/c/17511bd84871f4a6106cb335616e086880313f3f
• https://git.kernel.org/stable/c/1d80d57ffcb55488f0ec0b77928d4f82d16b6a90