diff options
| author | Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> | 2012-07-19 06:13:36 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-08-09 08:31:30 -0700 |
| commit | 20855fe2097ccfde927c6997101ae35340f1d278 (patch) | |
| tree | b185ec5c08472d49f5c96c65c0a4b9d51e41cfc1 /net/socket.c | |
| parent | ecbd55f98e07e25d4017077d0a611ce6c766257b (diff) | |
tun: fix a crash bug and a memory leak
commit b09e786bd1dd66418b69348cb110f3a64764626a upstream.
This patch fixes a crash
tun_chr_close -> netdev_run_todo -> tun_free_netdev -> sk_release_kernel ->
sock_release -> iput(SOCK_INODE(sock))
introduced by commit 1ab5ecb90cb6a3df1476e052f76a6e8f6511cb3d
The problem is that this socket is embedded in struct tun_struct, it has
no inode, iput is called on invalid inode, which modifies invalid memory
and optionally causes a crash.
sock_release also decrements sockets_in_use, this causes a bug that
"sockets: used" field in /proc/*/net/sockstat keeps on decreasing when
creating and closing tun devices.
This patch introduces a flag SOCK_EXTERNALLY_ALLOCATED that instructs
sock_release to not free the inode and not decrement sockets_in_use,
fixing both memory corruption and sockets_in_use underflow.
It should be backported to 3.3 an 3.4 stabke.
Signed-off-by: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/socket.c')
| -rw-r--r-- | net/socket.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/socket.c b/net/socket.c index 851edcd6b098..573b26152a30 100644 --- a/net/socket.c +++ b/net/socket.c @@ -522,6 +522,9 @@ void sock_release(struct socket *sock) if (rcu_dereference_protected(sock->wq, 1)->fasync_list) printk(KERN_ERR "sock_release: fasync list not empty!\n"); + if (test_bit(SOCK_EXTERNALLY_ALLOCATED, &sock->flags)) + return; + percpu_sub(sockets_in_use, 1); if (!sock->file) { iput(SOCK_INODE(sock)); |