From 5171dcb98226332ba27c4d037367100b8564997b Mon Sep 17 00:00:00 2001
From: Ben Harris <bjh21@bjh21.me.uk>
Date: Tue, 13 Oct 2015 20:33:12 +0100
Subject: [PATCH] Check the x argument to check_boundary() more carefully.

This is a minimal fix for CVE-2015-5309, and while it's probably
unnecessary now, it seems worth committing for defence in depth and to
give downstreams something reasonably non-intrusive to cherry-pick.
---
 terminal.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/terminal.c b/terminal.c
index 7aafb58b..26a3f0c9 100644
--- a/terminal.c
+++ b/terminal.c
@@ -2344,7 +2344,7 @@ static void check_boundary(Terminal *term, int x, int y)
     termline *ldata;
 
     /* Validate input coordinates, just in case. */
-    if (x == 0 || x > term->cols)
+    if (x <= 0 || x > term->cols)
 	return;
 
     ldata = scrlineptr(y);