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| author | Xin Long <lucien.xin@gmail.com> | 2019-03-13 12:00:48 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-03-14 00:22:49 +0300 |
| commit | 9417d81f4f8adfe20a12dd1fadf73a618cbd945d (patch) | |
| tree | e5909be0f6b3404f4a85c7bc184aa21b7dc32c45 /drivers/net/ppp | |
| parent | 63b6c974c24cc6a56cd1c17609d8d218dcff999c (diff) | |
| download | linux-9417d81f4f8adfe20a12dd1fadf73a618cbd945d.tar.xz | |
pptp: dst_release sk_dst_cache in pptp_sock_destruct
sk_setup_caps() is called to set sk->sk_dst_cache in pptp_connect,
so we have to dst_release(sk->sk_dst_cache) in pptp_sock_destruct,
otherwise, the dst refcnt will leak.
It can be reproduced by this syz log:
r1 = socket$pptp(0x18, 0x1, 0x2)
bind$pptp(r1, &(0x7f0000000100)={0x18, 0x2, {0x0, @local}}, 0x1e)
connect$pptp(r1, &(0x7f0000000000)={0x18, 0x2, {0x3, @remote}}, 0x1e)
Consecutive dmesg warnings will occur:
unregister_netdevice: waiting for lo to become free. Usage count = 1
v1->v2:
- use rcu_dereference_protected() instead of rcu_dereference_check(),
as suggested by Eric.
Fixes: 00959ade36ac ("PPTP: PPP over IPv4 (Point-to-Point Tunneling Protocol)")
Reported-by: Xiumei Mu <xmu@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ppp')
| -rw-r--r-- | drivers/net/ppp/pptp.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/net/ppp/pptp.c b/drivers/net/ppp/pptp.c index 8f09edd811e9..50c60550f295 100644 --- a/drivers/net/ppp/pptp.c +++ b/drivers/net/ppp/pptp.c @@ -532,6 +532,7 @@ static void pptp_sock_destruct(struct sock *sk) pppox_unbind_sock(sk); } skb_queue_purge(&sk->sk_receive_queue); + dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1)); } static int pptp_create(struct net *net, struct socket *sock, int kern) |