linux-kernel - [051/165] netfilter: nf_ct_sip: validate Content-Length in TCP SIP messages

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Date:	Wed, 01 Jun 2011 17:10:21 +0900
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Patrick McHardy <kaber@...sh.net>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [051/165] netfilter: nf_ct_sip: validate Content-Length in TCP SIP messages

2.6.39-stable review patch.  If anyone has any objections, please let us know.

------------------
Content-Length: 813
Lines: 27


From: Patrick McHardy <kaber@...sh.net>

[ Upstream commit 274ea0e2a4cdf18110e5931b8ecbfef6353e5293 ]

Verify that the message length of a single SIP message, which is calculated
based on the Content-Length field contained in the SIP message, does not
exceed the packet boundaries.

Signed-off-by: Patrick McHardy <kaber@...sh.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 net/netfilter/nf_conntrack_sip.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -1461,6 +1461,8 @@ static int sip_help_tcp(struct sk_buff *
 		end += strlen("\r\n\r\n") + clen;
 
 		msglen = origlen = end - dptr;
+		if (msglen > datalen)
+			return NF_DROP;
 
 		ret = process_sip_msg(skb, ct, dataoff, &dptr, &msglen);
 		if (ret != NF_ACCEPT)


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