From: Pavel Emelyanov <xemul@parallels•com>
To: David Miller <davem@davemloft•net>,
Linux Netdev List <netdev@vger•kernel.org>
Cc: Giorgos Mavrikas <gmavrikas@gmail•com>
Subject: [PATCH net] tcp-repair: Handle zero-length data put in rcv queue
Date: Mon, 29 Oct 2012 19:05:33 +0400 [thread overview]
Message-ID: <508E9B3D.1050505@parallels.com> (raw)
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>
---
>From 8f70f4ea4f509a3772ee7eb5d9d5c2571a86652a Mon Sep 17 00:00:00 2001
From: Pavel Emelyanov <xemul@parallels•com>
Date: Mon, 29 Oct 2012 18:12:41 +0400
Subject: [PATCH] fix for repair queue getback
Signed-off-by: Pavel Emelyanov <xemul@parallels•com>
---
net/ipv4/tcp_input.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 432c366..ff5b746 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -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;
--
1.7.6.5
next reply other threads:[~2012-10-29 15:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-29 15:05 Pavel Emelyanov [this message]
2012-11-03 2:02 ` [PATCH net] tcp-repair: Handle zero-length data put in rcv queue David Miller
2012-11-03 16:15 ` Pavel Emelyanov
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