CVE-2021-47254

In CVE-2021-47254, the Linux kernel gfs2 subsystem has a use-after-free in gfs2_glock_shrink_scan. The GLF_LRU flag is checked under lru_lock to remove the glock from the lru list in __gfs2_glock_put(), but cond_resched_lock(&lru_lock) allows progress on the put side without deleting the glock fr...