From 33cdf63251a23d71906cb482bce4ca02ce6d94c0 Mon Sep 17 00:00:00 2001
From: Erik Quanstrom <quanstro@quanstro.net>
Date: Sun, 21 Oct 2012 12:08:49 -0400
Subject: libmemdraw: fix int size bug

R=rsc, quanstro
CC=plan9port.codebot
http://codereview.appspot.com/6657043
---
 src/libmemdraw/alloc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/libmemdraw')

diff --git a/src/libmemdraw/alloc.c b/src/libmemdraw/alloc.c
index b6ad61a7..fa23b5e0 100644
--- a/src/libmemdraw/alloc.c
+++ b/src/libmemdraw/alloc.c
@@ -141,7 +141,8 @@ byteaddr(Memimage *i, Point p)
 {
 	uchar *a;
 
-	a = i->data->bdata+i->zero+sizeof(u32int)*p.y*i->width;
+	/* careful to sign-extend negative p.y for 64-bits */
+	a = i->data->bdata+i->zero+(int)(sizeof(u32int)*p.y*i->width);
 
 	if(i->depth < 8){
 		/*
-- 
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