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netfilter: ctnetlink: don't permit ct creation with random tuple 

Userspace can cause kernel panic by not specifying orig/reply
tuple: kernel will create a tuple with random stack values.

Problem is that tuple.dst.dir will be random, too, which
causes nf_ct_tuplehash_to_ctrack() to return garbage.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@gnumonks.org>
This commit is contained in:
Florian Westphal 2013-02-11 23:22:38 +00:00 committed by Pablo Neira Ayuso
parent 547b4e7181
commit 442fad9423
1 changed files with 3 additions and 0 deletions
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3
net/netfilter/nf_conntrack_netlink.c
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@ -1705,6 +1705,9 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
if (nlh->nlmsg_flags & NLM_F_CREATE) {
enum ip_conntrack_events events;
if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
return -EINVAL;
ct = ctnetlink_create_conntrack(net, zone, cda, &otuple,
&rtuple, u3);
if (IS_ERR(ct))