From ecf57714191b77142da74035b748262cdc80dfb7 Mon Sep 17 00:00:00 2001
From: Tatsuya Kinoshita <tats@debian.org>
Date: Wed, 7 Dec 2016 21:50:56 +0900
Subject: Prevent negative values for offset and pos in push_link()

Bug-Debian: https://github.com/tats/w3m/issues/64
---
 file.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'file.c')

diff --git a/file.c b/file.c
index 134df82..35034ce 100644
--- a/file.c
+++ b/file.c
@@ -2311,8 +2311,12 @@ push_link(int cmd, int offset, int pos)
     struct link_stack *p;
     p = New(struct link_stack);
     p->cmd = cmd;
-    p->offset = offset;
-    p->pos = pos;
+    p->offset = (short)offset;
+    if (p->offset < 0)
+	p->offset = 0;
+    p->pos = (short)pos;
+    if (p->pos < 0)
+	p->pos = 0;
     p->next = link_stack;
     link_stack = p;
 }
-- 
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