From: fenner <fenner>
Date: Mon, 12 Nov 2001 21:59:44 +0000 (+0000)
Subject: Zero out IPv6 mask before using it.  This fixes expressions like
X-Git-Tag: libpcap-0.7.1~22
X-Git-Url: https://git.tcpdump.org/libpcap/commitdiff_plain/1c20fa1fee9f2a824fb9ba3e4d0c25ee268a3f70

Zero out IPv6 mask before using it.  This fixes expressions like
'net 2002::/16', which were previously non-deterministic based on
the previous contents of memory.

Reported by:	Pekka Savola <pekkas@netcore.fi>
---

diff --git a/gencode.c b/gencode.c
index cc93e2f8..b1b303ed 100644
--- a/gencode.c
+++ b/gencode.c
@@ -21,7 +21,7 @@
  */
 #ifndef lint
 static const char rcsid[] =
-    "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.158 2001-09-20 00:24:24 fenner Exp $ (LBL)";
+    "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.159 2001-11-12 21:59:44 fenner Exp $ (LBL)";
 #endif
 
 #ifdef HAVE_CONFIG_H
@@ -3265,6 +3265,7 @@ gen_mcode6(s1, s2, masklen, q)
 
 	if (sizeof(mask) * 8 < masklen)
 		bpf_error("mask length must be <= %u", (unsigned int)(sizeof(mask) * 8));
+	memset(&mask, 0, sizeof(mask));
 	memset(&mask, 0xff, masklen / 8);
 	if (masklen % 8) {
 		mask.s6_addr[masklen / 8] =