netfilter: ctnetlink: must check mark attributes vs NULL

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else we will oops (null deref) when the attributes aren't present.

Also add back the EOPNOTSUPP in case MARK filtering is requested but
kernel doesn't support it.

Fixes: 59c08c69c2 ("netfilter: ctnetlink: Support L3 protocol-filter on flush")
Reported-by: syzbot+e45eda8eda6e93a03959@syzkaller.appspotmail.com
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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Florian Westphal 2018-09-20 23:53:06 +02:00 • committed by Pablo Neira Ayuso

parent 0de22baabc

commit 9306425b70

1 changed files with 9 additions and 2 deletions

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net/netfilter/nf_conntrack_netlink.c

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