diff options
| author | Mikulas Patocka <[email protected]> | 2012-07-19 06:13:36 +0000 |
|---|---|---|
| committer | David S. Miller <[email protected]> | 2012-07-20 11:21:06 -0700 |
| commit | b09e786bd1dd66418b69348cb110f3a64764626a (patch) | |
| tree | e4f12db01edc11d669f32a2d3d6832b22f57f656 /net/lapb/lapb_subr.c | |
| parent | 521f549097a79dc55e18c3bc752ef2127ad70ac5 (diff) | |
tun: fix a crash bug and a memory leak
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 <[email protected]>
Cc: [email protected]
Signed-off-by: David S. Miller <[email protected]>
Diffstat (limited to 'net/lapb/lapb_subr.c')
0 files changed, 0 insertions, 0 deletions