From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Tue, 7 May 2013 01:22:18 +0000 (+0200)
Subject: netfilter: xt_TCPOPTSTRIP: fix possible mangling beyond packet boundary
X-Git-Tag: v3.10-rc3~18^2~38^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bc6bcb59dd7c184d229f9e86d08aa56059938a4c;p=pandora-kernel.git

netfilter: xt_TCPOPTSTRIP: fix possible mangling beyond packet boundary

This target assumes that tcph->doff is well-formed, that may be well
not the case. Add extra sanity checkings to avoid possible crash due
to read/write out of the real packet boundary. After this patch, the
default action on malformed TCP packets is to drop them. Moreover,
fragments are skipped.

Reported-by: Rafal Kupka <rkupka@telemetry.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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