From: Dmitriy Vyukov <dvyukov@google.com>
Date: Fri, 8 Feb 2013 15:05:19 +0000 (+0400)
Subject: runtime: fix integer overflow
X-Git-Tag: go1.1rc2~1106
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=45636db01bdf4bd50426067af72afbde3900ceb9;p=gostls13.git

runtime: fix integer overflow
The problem happens when end=0, then end-1 is very big number.
Observed with the new scheduler.

R=golang-dev, iant
CC=golang-dev
https://golang.org/cl/7307073
---

diff --git a/src/pkg/runtime/parfor.c b/src/pkg/runtime/parfor.c
index 36dd65852f..d146727430 100644
--- a/src/pkg/runtime/parfor.c
+++ b/src/pkg/runtime/parfor.c
@@ -145,7 +145,7 @@ runtime·parfordo(ParFor *desc)
 				// See if it has any work.
 				begin = (uint32)pos;
 				end = (uint32)(pos>>32);
-				if(begin >= end-1) {
+				if(begin+1 >= end) {
 					begin = end = 0;
 					break;
 				}