netfilter: nf_queue: fix reinject verdict handling

[ Upstream commit 946c0d8e6ed43dae6527e878d0077c1e11015db0 ]

This patch fixes netfilter hook traversal when there are more than 1 hooks
returning NF_QUEUE verdict. When the first queue reinjects the packet,
'nf_reinject' starts traversing hooks with a proper hook_index. However,
if it again receives a NF_QUEUE verdict (by some other netfilter hook), it
queues the packet with a wrong hook_index. So, when the second queue
reinjects the packet, it re-executes hooks in between.

Fixes: 960632ece694 ("netfilter: convert hook list to an array")
Signed-off-by: Jagdish Motwani <jagdish.motwani@sophos.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/netfilter/nf_queue.c b/net/netfilter/nf_queue.c
index d67a96a25a681e4ff99c3873cee6d856e3604812..7569ba00e732843958f616efc29458de65c65ecf 100644 (file)
--- a/net/netfilter/nf_queue.c
+++ b/net/netfilter/nf_queue.c
@@ -238,6 +238,7 @@ static unsigned int nf_iterate(struct sk_buff *skb,
 repeat:
                verdict = nf_hook_entry_hookfn(hook, skb, state);
                if (verdict != NF_ACCEPT) {
+                       *index = i;
                        if (verdict != NF_REPEAT)
                                return verdict;
                        goto repeat;