netfilter: do not propagate nf_queue errors in nf_hook_slow
commit f15850861860636c905b33a9a5be3dcbc2b0d56a
(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>
diff --git a/net/netfilter/core.c b/net/netfilter/core.c
index 3346829..afca6c7 100644
--- a/net/netfilter/core.c
+++ b/net/netfilter/core.c
@@ -180,17 +180,16 @@
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;