resolve_ref(): verify that the input refname has the right format

Signed-off-by: Michael Haggerty <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: mhagger

refs.c

@@ -504,6 +504,9 @@ const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *
 	if (flag)
 		*flag = 0;
 
+	if (check_refname_format(ref, REFNAME_ALLOW_ONELEVEL))
+		return NULL;
+
 	for (;;) {
 		char path[PATH_MAX];
 		struct stat st;