netdev - [PATCH] inet: race in wait for connect.

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Date:	Mon, 29 Oct 2007 13:52:22 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	netdev@...r.kernel.org
Subject: [PATCH] inet: race in wait for connect.

Fix possible race while waiting for connections in accept. I don't
know of a test case that could reproduce this directly.

The state of the socket should be checked before checking the queue.
If the socket has left the TCP_LISTEN state, then the accept queue
is no longer valid.

Signed-off-by: Stephen Hemminger <shemminger@...ux-foundation.org>

--- a/net/ipv4/inet_connection_sock.c	2007-10-26 11:54:41.000000000 -0700
+++ b/net/ipv4/inet_connection_sock.c	2007-10-29 08:34:03.000000000 -0700
@@ -203,12 +203,12 @@ static int inet_csk_wait_for_connect(str
 		if (reqsk_queue_empty(&icsk->icsk_accept_queue))
 			timeo = schedule_timeout(timeo);
 		lock_sock(sk);
-		err = 0;
-		if (!reqsk_queue_empty(&icsk->icsk_accept_queue))
-			break;
 		err = -EINVAL;
 		if (sk->sk_state != TCP_LISTEN)
 			break;
+		err = 0;
+		if (!reqsk_queue_empty(&icsk->icsk_accept_queue))
+			break;
 		err = sock_intr_errno(timeo);
 		if (signal_pending(current))
 			break;
-
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