In the Linux kernel, the following vulnerability has been resolved:

gfs2: Fix NULL pointer dereference in gfs2_log_flush

In gfs2_jindex_free(), set sdp->sd_jdesc to NULL under the log flush
lock to provide exclusion against gfs2_log_flush().

In gfs2_log_flush(), check if sdp->sd_jdesc is non-NULL before
dereferencing it.  Otherwise, we could run into a NULL pointer
dereference when outstanding glock work races with an unmount
(glock_work_func -> run_queue -> do_xmote -> inode_go_sync ->
gfs2_log_flush).

kernel.org https://git.kernel.org/stable/c/3429ef5f50909cee9e498c50f0c499b9397116ce [No types assigned]

kernel.org https://git.kernel.org/stable/c/35264909e9d1973ab9aaa2a1b07cda70f12bb828 [No types assigned]

kernel.org https://git.kernel.org/stable/c/f54f9d5368a4e92ede7dd078a62788dae3a7c6ef [No types assigned]