From: Cong Wang cong.wang@bytedance.com
[ Upstream commit 0cf6672b23c8aa9d9274798dd63cbf6ede77ef90 ]
If the dest psock does not set SK_PSOCK_TX_ENABLED, the skb can't be queued anywhere so must be dropped.
This one is found during code review.
Fixes: 799aa7f98d53 ("skmsg: Avoid lock_sock() in sk_psock_backlog()") Signed-off-by: Cong Wang cong.wang@bytedance.com Signed-off-by: Daniel Borkmann daniel@iogearbox.net Acked-by: John Fastabend john.fastabend@gmail.com Acked-by: Jakub Sitnicki jakub@cloudflare.com Link: https://lore.kernel.org/bpf/20210615021342.7416-6-xiyou.wangcong@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/core/skmsg.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/net/core/skmsg.c b/net/core/skmsg.c index df545748cd6a..dd22ca838754 100644 --- a/net/core/skmsg.c +++ b/net/core/skmsg.c @@ -947,8 +947,13 @@ static void sk_psock_verdict_apply(struct sk_psock *psock, if (sk_psock_test_state(psock, SK_PSOCK_TX_ENABLED)) { skb_queue_tail(&psock->ingress_skb, skb); schedule_work(&psock->work); + err = 0; } spin_unlock_bh(&psock->ingress_lock); + if (err < 0) { + skb_bpf_redirect_clear(skb); + goto out_free; + } } break; case __SK_REDIRECT: