--- a/fs/gfs2/quota.c
+++ b/fs/gfs2/quota.c
@@ -1448,6 +1448,7 @@ int gfs2_quota_init(struct gfs2_sbd *sdp)
 
 fail:
 	gfs2_quota_cleanup(sdp);
+	sdp = NULL;
 	return error;
 }