From c8bc69bc2db9c57ccf979550bc69655df5039a8a Mon Sep 17 00:00:00 2001
From: Damien Neil <dneil@google.com>
Date: Wed, 27 Apr 2016 13:13:20 -0700
Subject: [PATCH] unix: fix uint64->int cast of control message header

Change-Id: I533233a08472b686d03573bcbae664c76919b18e
Reviewed-on: https://go-review.googlesource.com/22527
Run-TryBot: Damien Neil <dneil@google.com>
Reviewed-by: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
---
 unix/sockcmsg_unix.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/unix/sockcmsg_unix.go b/unix/sockcmsg_unix.go
index 70af5a72..f1493a3e 100644
--- a/unix/sockcmsg_unix.go
+++ b/unix/sockcmsg_unix.go
@@ -62,7 +62,7 @@ func ParseSocketControlMessage(b []byte) ([]SocketControlMessage, error) {
 
 func socketControlMessageHeaderAndData(b []byte) (*Cmsghdr, []byte, error) {
 	h := (*Cmsghdr)(unsafe.Pointer(&b[0]))
-	if h.Len < SizeofCmsghdr || int(h.Len) > len(b) {
+	if h.Len < SizeofCmsghdr || uint64(h.Len) > uint64(len(b)) {
 		return nil, nil, EINVAL
 	}
 	return h, b[cmsgAlignOf(SizeofCmsghdr):h.Len], nil