1 files changed, 19 insertions, 8 deletions

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index f88653138621..fc54a48fde1e 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1227,7 +1227,14 @@ int tcp_read_sock(struct sock *sk, read_descriptor_t *desc,
                                 copied += used;
                                 offset += used;
                         }
-                        if (offset != skb->len)
+                        /*
+                         * If recv_actor drops the lock (e.g. TCP splice
+                         * receive) the skb pointer might be invalid when
+                         * getting here: tcp_collapse might have deleted it
+                         * while aggregating skbs from the socket queue.
+                         */
+                        skb = tcp_recv_skb(sk, seq-1, &offset);
+                        if (!skb || (offset+1 != skb->len))
                                 break;
                 }
                 if (tcp_hdr(skb)->fin) {
@@ -2105,12 +2112,15 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
                 break;
 
         case TCP_DEFER_ACCEPT:
-                if (val < 0) {
-                        err = -EINVAL;
-                } else {
-                        if (val > MAX_TCP_ACCEPT_DEFERRED)
-                                val = MAX_TCP_ACCEPT_DEFERRED;
-                        icsk->icsk_accept_queue.rskq_defer_accept = val;
+                icsk->icsk_accept_queue.rskq_defer_accept = 0;
+                if (val > 0) {
+                        /* Translate value in seconds to number of
+                         * retransmits */
+                        while (icsk->icsk_accept_queue.rskq_defer_accept < 32 &&
+                               val > ((TCP_TIMEOUT_INIT / HZ) <<
+                                       icsk->icsk_accept_queue.rskq_defer_accept))
+                                icsk->icsk_accept_queue.rskq_defer_accept++;
+                        icsk->icsk_accept_queue.rskq_defer_accept++;
                 }
                 break;
 
@@ -2292,7 +2302,8 @@ static int do_tcp_getsockopt(struct sock *sk, int level,
                         val = (val ? : sysctl_tcp_fin_timeout) / HZ;
                 break;
         case TCP_DEFER_ACCEPT:
-                val = icsk->icsk_accept_queue.rskq_defer_accept;
+                val = !icsk->icsk_accept_queue.rskq_defer_accept ? 0 :
+                        ((TCP_TIMEOUT_INIT / HZ) << (icsk->icsk_accept_queue.rskq_defer_accept - 1));
                 break;
         case TCP_WINDOW_CLAMP:
                 val = tp->window_clamp;