From 2d86995273e431b40c2bd30c694ea405cc698118 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Wed, 15 Jun 2016 12:48:58 +0200
Subject: [PATCH] GETRANGE: return empty string with negative, inverted
 start/end.

---
 src/bitops.c   | 4 ++--
 src/t_string.c | 4 ++++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/bitops.c b/src/bitops.c
index 2312432fc..781cc58d6 100644
--- a/src/bitops.c
+++ b/src/bitops.c
@@ -773,12 +773,12 @@ void bitcountCommand(client *c) {
         if (getLongFromObjectOrReply(c,c->argv[3],&end,NULL) != C_OK)
             return;
         /* Convert negative indexes */
-        if (start < 0) start = strlen+start;
-        if (end < 0) end = strlen+end;
         if (start < 0 && end < 0 && start > end) {
             addReply(c,shared.czero);
             return;
         }
+        if (start < 0) start = strlen+start;
+        if (end < 0) end = strlen+end;
         if (start < 0) start = 0;
         if (end < 0) end = 0;
         if (end >= strlen) end = strlen-1;
diff --git a/src/t_string.c b/src/t_string.c
index 35eb9d7c1..8c737c4e3 100644
--- a/src/t_string.c
+++ b/src/t_string.c
@@ -263,6 +263,10 @@ void getrangeCommand(client *c) {
     }
 
     /* Convert negative indexes */
+    if (start < 0 && end < 0 && start > end) {
+        addReply(c,shared.emptybulk);
+        return;
+    }
     if (start < 0) start = strlen+start;
     if (end < 0) end = strlen+end;
     if (start < 0) start = 0;