gfs2: Fix NULL pointer dereference in gfs2_log_flush

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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).

Source published

29 Jul 2024 15:52:41 UTC

Source modified

15 Oct 2026 00:47:28 UTC

Observed here

23 Oct 2026 15:48:27 UTC

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