ksmbd: fix WARNING "do not call blocking ops when !TASK_RUNNING"

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix WARNING "do not call blocking ops when !TASK_RUNNING" wait_event_timeout() will set the state of the current task to TASK_UNINTERRUPTIBLE, before doing the condition check. This means that ksmbd_durable_scavenger_alive() will try to acquire the mutex while already in a sleeping state. The scheduler warns us by giving the following warning: do not call blocking ops when !TASK_RUNNING; state=2 set at [<0000000061515a6f>] prepare_to_wait_event+0x9f/0x6c0 WARNING: CPU: 2 PID: 4147 at kernel/sched/core.c:10099 __might_sleep+0x12f/0x160 mutex lock is not needed in ksmbd_durable_scavenger_alive().

References

• https://git.kernel.org/stable/c/8f805b3746d2f41702c77cba22f94f8415fadd1a
• https://git.kernel.org/stable/c/cd161198e091e8a62b9bd631be970ea9a87d2d6a
• https://git.kernel.org/stable/c/1df0d4c616138784e033ad337961b6e1a6bcd999