[GFS2] BZ 217008 fsfuzzer fix.

Update the quilt header comments to match the
code changes.

Change gfs2_lookup_simple to return an error in the case
of a NULL inode.
The callers of gfs2_lookup_simple do not check for NULL
in the no entry case and such would end up dereferencing a NULL ptr.

This fixes:
http://projects.info-pull.com/mokb/MOKB-15-11-2006.html

Signed-off-by: Russell Cattelan <cattelan@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 6bc443644c3c..bab338f6b610 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -361,8 +361,18 @@ out:
 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
 {
         struct qstr qstr;
+        struct inode *inode;
         gfs2_str2qstr(&qstr, name);
-        return gfs2_lookupi(dip, &qstr, 1, NULL);
+        inode = gfs2_lookupi(dip, &qstr, 1, NULL);
+        /* gfs2_lookupi has inconsistent callers: vfs
+         * related routines expect NULL for no entry found,
+         * gfs2_lookup_simple callers expect ENOENT
+         * and do not check for NULL.
+         */
+        if (inode == NULL)
+                return ERR_PTR(-ENOENT);
+        else
+                return inode;
 }