Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...

[firefly-linux-kernel-4.4.55.git] / net / ipv4 / tcp.c

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 1ca253635f7acdda23624c28ae1ead4645bd0dd5..2aa69c8ae60c1990c76e69fe5aef46b990b6da6e 100644 (file)
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1428,12 +1428,12 @@ static void tcp_service_net_dma(struct sock *sk, bool wait)
 }
 #endif
 
-static inline struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off)
+static struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off)
 {
        struct sk_buff *skb;
        u32 offset;
 
-       skb_queue_walk(&sk->sk_receive_queue, skb) {
+       while ((skb = skb_peek(&sk->sk_receive_queue)) != NULL) {
                offset = seq - TCP_SKB_CB(skb)->seq;
                if (tcp_hdr(skb)->syn)
                        offset--;
@@ -1441,6 +1441,11 @@ static inline struct sk_buff *tcp_recv_skb(struct sock *sk, u32 seq, u32 *off)
                        *off = offset;
                        return skb;
                }
+               /* This looks weird, but this can happen if TCP collapsing
+                * splitted a fat GRO packet, while we released socket lock
+                * in skb_splice_bits()
+                */
+               sk_eat_skb(sk, skb, false);
        }
        return NULL;
 }
@@ -1482,7 +1487,7 @@ int tcp_read_sock(struct sock *sk, read_descriptor_t *desc,
                                        break;
                        }
                        used = recv_actor(desc, skb, offset, len);
-                       if (used < 0) {
+                       if (used <= 0) {
                                if (!copied)
                                        copied = used;
                                break;
@@ -1520,8 +1525,10 @@ int tcp_read_sock(struct sock *sk, read_descriptor_t *desc,
        tcp_rcv_space_adjust(sk);
 
        /* Clean up data we have read: This will do ACK frames. */
-       if (copied > 0)
+       if (copied > 0) {
+               tcp_recv_skb(sk, seq, &offset);
                tcp_cleanup_rbuf(sk, copied);
+       }
        return copied;
 }
 EXPORT_SYMBOL(tcp_read_sock);