From: Patrick McHardy <kaber@trash.net>
Date: Tue, 20 Jun 2006 06:39:45 +0000 (-0700)
Subject: [NETFILTER]: xt_sctp: fix endless loop caused by 0 chunk length
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d3dcd4efe2ad1ad1865b2fe5c863c1ebd9482a84;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

[NETFILTER]: xt_sctp: fix endless loop caused by 0 chunk length

Fix endless loop in the SCTP match similar to those already fixed in
the SCTP conntrack helper (was CVE-2006-1527).

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/netfilter/xt_sctp.c b/net/netfilter/xt_sctp.c
index b5110e5b54b0..9316c753692f 100644
--- a/net/netfilter/xt_sctp.c
+++ b/net/netfilter/xt_sctp.c
@@ -62,7 +62,7 @@ match_packet(const struct sk_buff *skb,
 
 	do {
 		sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch);
-		if (sch == NULL) {
+		if (sch == NULL || sch->length == 0) {
 			duprintf("Dropping invalid SCTP packet.\n");
 			*hotdrop = 1;
 			return 0;