diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index 6712d733fc90b361637c213c168625fc17036448..6c708ccbdf3c819ab87c6bb9560055206c7854e9 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -444,6 +444,9 @@ int dlm_search_rsb_tree(struct rb_root *tree, const void *name, int len,
 	struct dlm_rsb *r;
 	int rc;
 
+	if (len > DLM_RESNAME_MAXLEN)
+		return -EINVAL;
+
 	while (node) {
 		r = rb_entry(node, struct dlm_rsb, res_hashnode);
 		rc = rsb_cmp(r, name, len);