netdev - tcp: Try to catch MSG

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Message-ID: <20091020054106.GA5507@gondor.apana.org.au>
Date:	Tue, 20 Oct 2009 14:41:06 +0900
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: tcp: Try to catch MSG_PEEK bug

Hi:

tcp: Try to catch MSG_PEEK bug

This patch tries to print out more information when we hit the
MSG_PEEK bug in tcp_recvmsg.  It's been around since at least
2005 and it's about time that we finally fix it.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Cheer,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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--
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 64d0af6..fb881d5 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -1405,7 +1405,9 @@ int tcp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
 				goto found_ok_skb;
 			if (tcp_hdr(skb)->fin)
 				goto found_fin_ok;
-			WARN_ON(!(flags & MSG_PEEK));
+			if (WARN_ON(!(flags & MSG_PEEK)))
+				printk(KERN_INFO "recvmsg bug 2: copied %X "
+				       "seq %X\n", *seq, TCP_SKB_CB(skb)->seq);
 		}
 
 		/* Well, if we have backlog, try to process it now yet. */
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