From 7db05be097841d497de430adc39349ba3989a6e9 Mon Sep 17 00:00:00 2001
From: Christos Zoulas <christos@zoulas.com>
Date: Thu, 16 Sep 1993 21:09:35 +0000
Subject: [PATCH] Is_tar now takes the length in bytes of the buffer to be
 tested.

---
 src/is_tar.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/is_tar.c b/src/is_tar.c
index 789f04e5..5b036be1 100644
--- a/src/is_tar.c
+++ b/src/is_tar.c
@@ -5,7 +5,7 @@
  * Pubic Domain version written 26 Aug 1985 John Gilmore (ihnp4!hoptoad!gnu).
  *
  * @(#)list.c 1.18 9/23/86 Public Domain - gnu
- * $Id: is_tar.c,v 1.7 1992/09/08 15:32:19 ian Exp $
+ * $Id: is_tar.c,v 1.8 1993/09/16 21:09:35 christos Exp $
  *
  * Comments changed and some code/comments reformatted
  * for file command by Ian Darwin.
@@ -31,14 +31,18 @@ static long from_oct();
  *	2 for Unix Std (POSIX) tar file.
  */
 int
-is_tar(buf)
+is_tar(buf, nbytes)
 unsigned char *buf;
+int nbytes;
 {
 	register union record *header = (union record *)buf;
 	register int	i;
 	register long	sum, recsum;
 	register char	*p;
 
+	if (nbytes < sizeof(union record))
+		return 0;
+
 	recsum = from_oct(8,  header->header.chksum);
 
 	sum = 0;
-- 
2.40.0