diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2011-03-21 18:18:00 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-03-21 18:18:00 -0700 |
| commit | b20e7bbfc7a15a4182730f0936433145992b4b06 (patch) | |
| tree | 81df1570eb7840b9ed5b981ad2e437b773448f5a /net/appletalk | |
| parent | 674f2115995b7b588cbf3540c9f9b2448a8c7ea8 (diff) | |
| download | lwn-b20e7bbfc7a15a4182730f0936433145992b4b06.tar.gz lwn-b20e7bbfc7a15a4182730f0936433145992b4b06.zip | |
net/appletalk: fix atalk_release use after free
The BKL removal in appletalk introduced a use-after-free problem,
where atalk_destroy_socket frees a sock, but we still release
the socket lock on it.
An easy fix is to take an extra reference on the sock and sock_put
it when returning from atalk_release.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/appletalk')
| -rw-r--r-- | net/appletalk/ddp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c index 3d4f4b043406..206e771e82d1 100644 --- a/net/appletalk/ddp.c +++ b/net/appletalk/ddp.c @@ -1051,6 +1051,7 @@ static int atalk_release(struct socket *sock) { struct sock *sk = sock->sk; + sock_hold(sk); lock_sock(sk); if (sk) { sock_orphan(sk); @@ -1058,6 +1059,8 @@ static int atalk_release(struct socket *sock) atalk_destroy_socket(sk); } release_sock(sk); + sock_put(sk); + return 0; } |