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.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/t_string.c b/src/t_string.c
index 2bf772a2d..f06693815 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);