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netfilter: do not propagate nf_queue errors in nf_hook_slow 

commit f158508618
(netfilter: nfnetlink_queue: return error number to caller)
erronously assigns the return value of nf_queue() to the "ret" value.

This can cause bogus return values if we encounter QUEUE verdict
when bypassing is enabled, the listener does not exist and the
next hook returns NF_STOLEN.

In this case nf_hook_slow returned -ESRCH instead of 0.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2011-10-31 12:20:16 +01:00 committed by Pablo Neira Ayuso
parent 0e05e192c0
commit 563e123264
1 changed files with 5 additions and 6 deletions
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11
net/netfilter/core.c
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@ -180,17 +180,16 @@ next_hook:
if (ret == 0)
ret = -EPERM;
} else if ((verdict & NF_VERDICT_MASK) == NF_QUEUE) {
ret = nf_queue(skb, elem, pf, hook, indev, outdev, okfn,
verdict >> NF_VERDICT_QBITS);
if (ret < 0) {
if (ret == -ECANCELED)
int err = nf_queue(skb, elem, pf, hook, indev, outdev, okfn,
verdict >> NF_VERDICT_QBITS);
if (err < 0) {
if (err == -ECANCELED)
goto next_hook;
if (ret == -ESRCH &&
if (err == -ESRCH &&
(verdict & NF_VERDICT_FLAG_QUEUE_BYPASS))
goto next_hook;
kfree_skb(skb);
}
ret = 0;
}
rcu_read_unlock();
return ret;