1 files changed, 2 insertions, 0 deletions
diff --git a/refs.c b/refs.c
index da09e434c..03e8dfec9 100644
--- a/refs.c
+++ b/refs.c
@@ -663,6 +663,8 @@ struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
 
 struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1)
 {
+	if (check_ref_format(ref) == -1)
+		return NULL;
 	return lock_ref_sha1_basic(ref, old_sha1, NULL);
 }