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authorMichal Nazarewicz <mina86@mina86.com>2013-11-12 13:30:05 +0100
committerSteven Whitehouse <swhiteho@redhat.com>2013-11-21 09:55:45 +0000
commite3c4269d139db7471ee560fb30948179e180b3d4 (patch)
tree667d0743b7942e023b15b687714c3015fce2e868 /fs/gfs2/glock.c
parent527d1511310a89650000081869260394e20c7013 (diff)
downloadlinux-e3c4269d139db7471ee560fb30948179e180b3d4.tar.bz2
GFS2: fix potential NULL pointer dereference
Commit [e66cf1610: GFS2: Use lockref for glocks] replaced call: atomic_read(&gi->gl->gl_ref) == 0 with: __lockref_is_dead(&gl->gl_lockref) therefore changing how gl is accessed, from gi->gl to plan gl. However, gl can be a NULL pointer, and so gi->gl needs to be used instead (which is guaranteed not to be NULL because fo the while loop checking that condition). Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/glock.c')
-rw-r--r--fs/gfs2/glock.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index e66a8009aff1..c8420f7e4db6 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -1899,7 +1899,8 @@ static int gfs2_glock_iter_next(struct gfs2_glock_iter *gi)
gi->nhash = 0;
}
/* Skip entries for other sb and dead entries */
- } while (gi->sdp != gi->gl->gl_sbd || __lockref_is_dead(&gl->gl_lockref));
+ } while (gi->sdp != gi->gl->gl_sbd ||
+ __lockref_is_dead(&gi->gl->gl_lockref));
return 0;
}