tcp: call tcp_drop() from tcp_data_queue_ofo()

[ Upstream commit 8541b21e781a22dce52a74fef0b9bed00404a1cd ]

In order to be able to give better diagnostics and detect
malicious traffic, we need to have better sk->sk_drops tracking.

Fixes: 9f5afeae5152 ("tcp: use an RB tree for ooo receive queue")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 6f09c45dc20cec916a6a038d022ee87c220d1d8f..35b0e38fe31aad800d943a029fe5ee5bdd1ec498 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4492,7 +4492,7 @@ coalesce_done:
                                /* All the bits are present. Drop. */
                                NET_INC_STATS(sock_net(sk),
                                              LINUX_MIB_TCPOFOMERGE);
-                               __kfree_skb(skb);
+                               tcp_drop(sk, skb);
                                skb = NULL;
                                tcp_dsack_set(sk, seq, end_seq);
                                goto add_sack;
@@ -4511,7 +4511,7 @@ coalesce_done:
                                                 TCP_SKB_CB(skb1)->end_seq);
                                NET_INC_STATS(sock_net(sk),
                                              LINUX_MIB_TCPOFOMERGE);
-                               __kfree_skb(skb1);
+                               tcp_drop(sk, skb1);
                                goto merge_right;
                        }
                } else if (tcp_try_coalesce(sk, OOO_QUEUE, skb1,