[PATCH AUTOSEL 4.14 03/31] netfilter: nf_queue: fix reinject verdict handling

From: Sasha Levin
Date: Sat Jun 08 2019 - 07:51:27 EST

From: Jagdish Motwani <jagdish.motwani@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
net/netfilter/nf_queue.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/net/netfilter/nf_queue.c b/net/netfilter/nf_queue.c
index f7e21953b1de..8260b1e73bbd 100644
--- a/net/netfilter/nf_queue.c
+++ b/net/netfilter/nf_queue.c
@@ -193,6 +193,7 @@ static unsigned int nf_iterate(struct sk_buff *skb,
verdict = nf_hook_entry_hookfn(hook, skb, state);
if (verdict != NF_ACCEPT) {
+ *index = i;
if (verdict != NF_REPEAT)
return verdict;
goto repeat;