From d8e7ea48dc48db500990ad0d752972a06c0bbed8 Mon Sep 17 00:00:00 2001
From: Michael Elkins <me@sigpipe.org>
Date: Sun, 8 Aug 2010 14:52:50 -0700
Subject: [PATCH] fix buffer underrun when processing ANSI escape sequences

closes #3371
---
 pager.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pager.c b/pager.c
index 484f4412..0c2259f0 100644
--- a/pager.c
+++ b/pager.c
@@ -1057,7 +1057,7 @@ fill_buffer (FILE *f, LOFF_T *last_pos, LOFF_T offset, unsigned char **buf,
       {
 	if (*(p+1) == '_')	/* underline */
 	  p += 2;
-	else if (*(p+1))	/* bold or overstrike */
+	else if (*(p+1) && q > *fmt)	/* bold or overstrike */
 	{
 	  *(q-1) = *(p+1);
 	  p += 2;
-- 
2.40.0