netfilter: x_tables: check standard target size too

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We have targets and standard targets -- the latter carries a verdict.

The ip/ip6tables validation functions will access t->verdict for the
standard targets to fetch the jump offset or verdict for chainloop
detection, but this happens before the targets get checked/validated.

Thus we also need to check for verdict presence here, else t->verdict
can point right after a blob.

Spotted with UBSAN while testing malformed blobs.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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Florian Westphal 2016-04-01 14:17:27 +02:00 • committed by Pablo Neira Ayuso

parent fc1221b3a1

commit 7ed2abddd2

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net/netfilter/x_tables.c

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