forked from Minki/linux
tun: don't zeroize sock->file on detach
This is a fix for bug, introduced in 3.4 kernel by commit
1ab5ecb90c
("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.
Cc: stable@vger.kernel.org
Reported-by: Ruan Zhijie <ruanzhijie@hotmail.com>
Tested-by: Ruan Zhijie <ruanzhijie@hotmail.com>
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
a2d6a1d5a4
commit
66d1b9263a
@ -187,7 +187,6 @@ static void __tun_detach(struct tun_struct *tun)
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netif_tx_lock_bh(tun->dev);
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netif_carrier_off(tun->dev);
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tun->tfile = NULL;
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tun->socket.file = NULL;
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netif_tx_unlock_bh(tun->dev);
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/* Drop read queue */
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