From: Jan Engelhardt <jengelh@medozas.de>
Date: Sun, 10 Jul 2011 09:47:46 +0000 (+0200)
Subject: libxtables: set clone's initial data to NULL
X-Git-Tag: v1.4.12~1^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3eab786d6a687187556c92b3dc0f0664d8352471;p=thirdparty%2Fiptables.git

libxtables: set clone's initial data to NULL

Avoid a crash in xs_init_match when a clone's m->udata points at the
parent.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
---

diff --git a/iptables/xtables.c b/iptables/xtables.c
index b05df97b..1a5e568c 100644
--- a/iptables/xtables.c
+++ b/iptables/xtables.c
@@ -632,6 +632,7 @@ xtables_find_match(const char *name, enum xtables_tryload tryload,
 			/* Second and subsequent clones */
 			clone = xtables_malloc(sizeof(struct xtables_match));
 			memcpy(clone, ptr, sizeof(struct xtables_match));
+			clone->udata = NULL;
 			clone->mflags = 0;
 			/* This is a clone: */
 			clone->next = clone;