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netfilter: nfqueue: don't use prev pointer

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Usage of -prev seems buggy.  While packet was out our hook cannot be
removed but we have no way to know if the previous one is still valid.

So better not use ->prev at all.  Since NF_REPEAT just asks to invoke
same hook function again, just do so, and continue with nf_interate
if we get an ACCEPT verdict.

A side effect of this change is that if nf_reinject(NF_REPEAT) causes
another REPEAT we will now drop the skb instead of a kernel loop.

However, NF_REPEAT loops would be a bug so this should not happen anyway.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2015-10-09 13:10:37 +02:00 committed by Pablo Neira Ayuso
parent 914eebf2f4
commit 7ceebfe46e
1 changed files with 2 additions and 4 deletions
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6
net/netfilter/nf_queue.c
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@ -192,10 +192,8 @@ void nf_reinject(struct nf_queue_entry *entry, unsigned int verdict)
nf_queue_entry_release_refs(entry);
/* Continue traversal iff userspace said ok... */
if (verdict == NF_REPEAT) {
elem = list_entry(elem->list.prev, struct nf_hook_ops, list);
verdict = NF_ACCEPT;
}
if (verdict == NF_REPEAT)
verdict = elem->hook(elem->priv, skb, &entry->state);
if (verdict == NF_ACCEPT) {
afinfo = nf_get_afinfo(entry->state.pf);