From: Russ Cox <rsc@golang.org>
Date: Fri, 29 Aug 2014 14:29:00 +0000 (-0400)
Subject: runtime: fix sprintf index out of bounds
X-Git-Tag: go1.4beta1~631
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=6f19fd438e2178d086c4352b439e857bd08051bd;p=gostls13.git

runtime: fix sprintf index out of bounds

Breaks on Plan 9, apparently.
The other systems must not run sprintf during all.bash.
I'd write a test but it's all going away.

TBR=r
CC=0intro, golang-codereviews
https://golang.org/cl/133260044
---

diff --git a/src/pkg/runtime/print1.go b/src/pkg/runtime/print1.go
index 9df6a621bb..f19cc1da59 100644
--- a/src/pkg/runtime/print1.go
+++ b/src/pkg/runtime/print1.go
@@ -46,7 +46,7 @@ func printf(s *byte) {
 // It has the same problem as goprintf.
 //go:nosplit
 func snprintf(dst *byte, n int32, s *byte) {
-	buf := (*[1 << 30]byte)(unsafe.Pointer(dst))[0:0:n]
+	buf := (*[1 << 30]byte)(unsafe.Pointer(dst))[0:n:n]
 
 	gp := getg()
 	gp.writebuf = buf[0:0 : n-1] // leave room for NUL, this is called from C