From 35db25c65f6f77c153ef2b1183ea7821236201c8 Mon Sep 17 00:00:00 2001
From: Michael Haggerty <mhagger@alum.mit.edu>
Date: Wed, 27 Apr 2016 12:42:27 +0200
Subject: [PATCH] refname_is_safe(): don't allow the empty string

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>
---
 refs.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/refs.c b/refs.c
index 5789152743..ca0280f7eb 100644
--- a/refs.c
+++ b/refs.c
@@ -136,11 +136,12 @@ int refname_is_safe(const char *refname)
 		free(buf);
 		return result;
 	}
-	while (*refname) {
+
+	do {
 		if (!isupper(*refname) && *refname != '_')
 			return 0;
 		refname++;
-	}
+	} while (*refname);
 	return 1;
 }