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Commit 35264909 authored by Andreas Gruenbacher's avatar Andreas Gruenbacher
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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).

Signed-off-by: default avatarAndreas Gruenbacher <agruenba@redhat.com>
parent b0118933
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