kernel: dm thin: Fix UAF in run_timer_softirq()

In the Linux kernel, the following vulnerability has been resolved: dm thin: Fix UAF in runtimersoftirq When dmresume and dmdestroy are concurrent, it will lead to UAF, as follows: BUG: KASAN: use-after-free in runtimers+0x173/0x710 Write of size 8 at addr ffff88816d9490f0 by task swapper/0/0 Cal...