gfs2: Fix NULL pointer dereference in gfs2_log_flush

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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).

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

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This commit is contained in:

Andreas Gruenbacher 2024-03-11 15:51:59 +01:00

parent b01189333e

commit 35264909e9

2 changed files with 6 additions and 1 deletions

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3

fs/gfs2/log.c

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4

fs/gfs2/super.c

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