Commit c454e611 authored Oct 29, 2012 by Pavel Emelyanov Committed by David S. Miller Nov 02, 2012

tcp-repair: Handle zero-length data put in rcv queue



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 <xemul@parallels.com>
Reported-by: Giorgos Mavrikas <gmavrikas@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent a4d7e485

net/ipv4/tcp_input.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -4529,6 +4529,9 @@ int tcp_send_rcvq(struct sock sk, struct msghdr msg, size_t size)
		struct tcphdr *th;
		bool fragstolen;

		if (size == 0)
		return 0;

		skb = alloc_skb(size + sizeof(*th), sk->sk_allocation);
		if (!skb)
		goto err;