linux-kernel - [ 31/37] tun: dont zeroize sock->file on detach

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Message-Id: <20120817030248.728449300@decadent.org.uk>
Date:	Fri, 17 Aug 2012 04:03:14 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Stanislav Kinsbursky <skinsbursky@...allels.com>,
	Ruan Zhijie <ruanzhijie@...mail.com>,
	Al Viro <viro@...IV.linux.org.uk>,
	Eric Dumazet <edumazet@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 31/37] tun: dont zeroize sock->file on detach

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Stanislav Kinsbursky <skinsbursky@...allels.com>

commit 66d1b9263a371abd15806c53f486f0645ef31a8f upstream.

This is a fix for bug, introduced in 3.4 kernel by commit
1ab5ecb90cb6a3df1476e052f76a6e8f6511cb3d ("tun: don't hold network
namespace by tun sockets"), which, among other things, replaced simple
sock_put() by sk_release_kernel(). Below is sequence, which leads to
oops for non-persistent devices:

tun_chr_close()
tun_detach()				<== tun->socket.file = NULL
tun_free_netdev()
sk_release_sock()
sock_release(sock->file == NULL)
iput(SOCK_INODE(sock))			<== dereference on NULL pointer

This patch just removes zeroing of socket's file from __tun_detach().
sock_release() will do this.

Reported-by: Ruan Zhijie <ruanzhijie@...mail.com>
Tested-by: Ruan Zhijie <ruanzhijie@...mail.com>
Acked-by: Al Viro <viro@...IV.linux.org.uk>
Acked-by: Eric Dumazet <edumazet@...gle.com>
Acked-by: Yuchung Cheng <ycheng@...gle.com>
Signed-off-by: Stanislav Kinsbursky <skinsbursky@...allels.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/tun.c |    1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 926d4db..3a16d4f 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -187,7 +187,6 @@ static void __tun_detach(struct tun_struct *tun)
 	netif_tx_lock_bh(tun->dev);
 	netif_carrier_off(tun->dev);
 	tun->tfile = NULL;
-	tun->socket.file = NULL;
 	netif_tx_unlock_bh(tun->dev);
 
 	/* Drop read queue */


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