tree 1305eb74bb354d76cc815910a3ebe1f803b7a6f4
parent 8cdb46da06ea94543a3b2e53e3e92736421d1093
author Pablo Neira Ayuso <pablo@netfilter.org> 1367889738 +0200
committer Pablo Neira Ayuso <pablo@netfilter.org> 1368718553 +0200

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>