[GFS2] fix bz 231369, gfs2 will oops if you specify an invalid mount option

If you specify an invalid mount option when trying to mount a gfs2 filesystem,
gfs2 will oops.  The attached patch resolves this problem.

Signed-off-by: Josef Whiter <jwhiter@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index 9f203ef4da610e68e516923cc45f905bf067ad68..a3a24f2e99d2b8421c1528e0c9e7d011ada72ff6 100644 (file)
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -2217,7 +2217,7 @@ int gfs2_create_debugfs_file(struct gfs2_sbd *sdp)
 
 void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp)
 {
-       if (sdp->debugfs_dentry)
+       if (sdp && sdp->debugfs_dentry)
                debugfs_remove(sdp->debugfs_dentry);
 }