diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index c01a291db401..a393ecaf3442 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -626,7 +626,8 @@ int dlm_search_rsb_tree(struct rhashtable *rhash, const void *name, int len,
 			struct dlm_rsb **r_ret)
 {
 	char key[DLM_RESNAME_MAXLEN] = {};
-
+	if (len > DLM_RESNAME_MAXLEN)
+		return -EINVAL;
 	memcpy(key, name, len);
 	*r_ret = rhashtable_lookup_fast(rhash, &key, dlm_rhash_rsb_params);
 	if (*r_ret)