LU-9856 mdd: handle NULL buffer in mdd_xattr_list()

[fs/lustre-release.git] / lustre / mdd / mdd_object.c

diff --git a/lustre/mdd/mdd_object.c b/lustre/mdd/mdd_object.c
index 03e8e5a..b6f4d4b 100644 (file)
--- a/lustre/mdd/mdd_object.c
+++ b/lustre/mdd/mdd_object.c
@@ -302,7 +302,9 @@ static int mdd_xattr_list(const struct lu_env *env, struct md_object *obj,
        rc = mdo_xattr_list(env, mdd_obj, buf);
         mdd_read_unlock(env, mdd_obj);
 
-       if (rc < 0)
+       /* If the buffer is NULL then we are only here to get the
+        * length of the xattr name list. */
+       if (rc < 0 || buf->lb_buf == NULL)
                RETURN(rc);
 
        /*