From fc843784c340865f105fa8da37001f044a613829 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Wed, 2 Mar 2016 16:20:28 +0100
Subject: [PATCH] BITFIELD: Farest bit set is offset+bits-1. Off by one error
 fixed.

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

diff --git a/src/bitops.c b/src/bitops.c
index 753db534..ed7e384a 100644
--- a/src/bitops.c
+++ b/src/bitops.c
@@ -964,8 +964,10 @@ void bitfieldCommand(client *c) {
              * for simplicity. SET return value is the previous value so
              * we need fetch & store as well. */
 
-            if ((o = lookupStringForBitCommand(c,thisop->offset + thisop->bits))
-                 == NULL) return;
+            /* Lookup by making room up to the farest bit reached by
+             * this operation. */
+            if ((o = lookupStringForBitCommand(c,
+                thisop->offset + (thisop->bits-1))) == NULL) return;
 
             /* We need two different but very similar code paths for signed
              * and unsigned operations, since the set of functions to get/set