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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>
This commit is contained in:
Pavel Emelyanov 2012-10-29 05:05:33 +00:00 committed by David S. Miller
parent a4d7e485bc
commit c454e6111d
1 changed files with 3 additions and 0 deletions
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3
net/ipv4/tcp_input.c
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@ -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;