From de321ed38471257ee45eac145bfd539254d13954 Mon Sep 17 00:00:00 2001 From: Andrey Vagin Date: Wed, 17 May 2017 11:39:05 -0700 Subject: net: fix __skb_try_recv_from_queue to return the old behavior This function has to return NULL on a error case, because there is a separate error variable. The offset has to be changed only if skb is returned v2: fix udp code to not use an extra variable Cc: Paolo Abeni Cc: Eric Dumazet Cc: David S. Miller Fixes: 65101aeca522 ("net/sock: factor out dequeue/peek with offset cod") Signed-off-by: Andrei Vagin Acked-by: Paolo Abeni Signed-off-by: David S. Miller --- net/ipv4/udp.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) (limited to 'net/ipv4/udp.c') diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 922a62d45714..e7b6cfcca627 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1465,16 +1465,13 @@ struct sk_buff *__skb_recv_udp(struct sock *sk, unsigned int flags, error = -EAGAIN; *peeked = 0; do { - int _off = *off; - spin_lock_bh(&queue->lock); skb = __skb_try_recv_from_queue(sk, queue, flags, udp_skb_destructor, - peeked, &_off, err, + peeked, off, err, &last); if (skb) { spin_unlock_bh(&queue->lock); - *off = _off; return skb; } @@ -1488,20 +1485,17 @@ struct sk_buff *__skb_recv_udp(struct sock *sk, unsigned int flags, * the sk_receive_queue lock if fwd memory scheduling * is needed. */ - _off = *off; spin_lock(&sk_queue->lock); skb_queue_splice_tail_init(sk_queue, queue); skb = __skb_try_recv_from_queue(sk, queue, flags, udp_skb_dtor_locked, - peeked, &_off, err, + peeked, off, err, &last); spin_unlock(&sk_queue->lock); spin_unlock_bh(&queue->lock); - if (skb) { - *off = _off; + if (skb) return skb; - } busy_check: if (!sk_can_busy_loop(sk)) -- cgit v1.2.3-59-g8ed1b