From b20df972edf56c53a27d47839cdf58130bc6dfdc Mon Sep 17 00:00:00 2001
From: Matt Stancliff <matt@genges.com>
Date: Tue, 2 Sep 2014 18:56:28 -0400
Subject: [PATCH] Return empty string if GETRANGE of empty string

Previously, GETRANGE of a key containing nothing ("")
would allocate a large (size_t)-1 return value causing
crashes on 32bit builds when it tried to allocate the
4 GB return string.
---
 src/t_string.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/t_string.c b/src/t_string.c
index 2bf772a2..f0669381 100644
--- a/src/t_string.c
+++ b/src/t_string.c
@@ -259,7 +259,7 @@ void getrangeCommand(redisClient *c) {
 
     /* Precondition: end >= 0 && end < strlen, so the only condition where
      * nothing can be returned is: start > end. */
-    if (start > end) {
+    if (start > end || strlen == 0) {
         addReply(c,shared.emptybulk);
     } else {
         addReplyBulkCBuffer(c,(char*)str+start,end-start+1);