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authorArnd Bergmann <arnd@arndb.de>2011-03-21 18:18:00 -0700
committerDavid S. Miller <davem@davemloft.net>2011-03-21 18:18:00 -0700
commitb20e7bbfc7a15a4182730f0936433145992b4b06 (patch)
tree81df1570eb7840b9ed5b981ad2e437b773448f5a /net/appletalk
parent674f2115995b7b588cbf3540c9f9b2448a8c7ea8 (diff)
downloadlinux-stericsson-b20e7bbfc7a15a4182730f0936433145992b4b06.tar.gz
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.c3
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;
}