From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, Pavel Emelyanov , Giorgos Mavrikas , "David S. Miller" Subject: [ 53/66] tcp-repair: Handle zero-length data put in rcv queue Date: Wed, 14 Nov 2012 20:10:58 -0800 Message-Id: <20121115040942.963040043@linuxfoundation.org> In-Reply-To: <20121115040939.016421011@linuxfoundation.org> References: <20121115040939.016421011@linuxfoundation.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pavel Emelyanov [ Upstream commit c454e6111d1ef4268fe98e87087216e51c2718c3 ] When sending data into a tcp socket in repair state we should check for the amount of data being 0 explicitly. Otherwise we'll have an skb with seq == end_seq in rcv queue, but tcp doesn't expect this to happen (in particular a warn_on in tcp_recvmsg shoots). Signed-off-by: Pavel Emelyanov Reported-by: Giorgos Mavrikas Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv4/tcp_input.c | 3 +++ 1 file changed, 3 insertions(+) --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -4556,6 +4556,9 @@ int tcp_send_rcvq(struct sock *sk, struc struct tcphdr *th; bool fragstolen; + if (size == 0) + return 0; + skb = alloc_skb(size + sizeof(*th), sk->sk_allocation); if (!skb) goto err;