diff options
| author | James Chapman <jchapman@katalix.com> | 2008-06-09 13:34:39 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-06-16 13:19:58 -0700 |
| commit | 42cd7667f27ebcf7c9aa3f814d8f0dd1aa1b39c1 (patch) | |
| tree | 972958d6dbb8af5fe31b90e796253d2eb35f13a6 /drivers | |
| parent | 413b0a22cad909f8cf86299ecf37d34df5d1eb38 (diff) | |
l2tp: Fix possible WARN_ON from socket code when UDP socket is closed
[ upstream commit: 199f7d24ae59894243687a234a909f44a8724506 ]
If an L2TP daemon closes a tunnel socket while packets are queued in
the tunnel's reorder queue, a kernel warning is logged because the
socket is closed while skbs are still referencing it. The fix is to
purge the queue in the socket's release handler.
WARNING: at include/net/sock.h:351 udp_lib_unhash+0x41/0x68()
Pid: 12998, comm: openl2tpd Not tainted 2.6.25 #8
[<c0423c58>] warn_on_slowpath+0x41/0x51
[<c05d33a7>] udp_lib_unhash+0x41/0x68
[<c059424d>] sk_common_release+0x23/0x90
[<c05d16be>] udp_lib_close+0x8/0xa
[<c05d8684>] inet_release+0x42/0x48
[<c0592599>] sock_release+0x14/0x60
[<c059299f>] sock_close+0x29/0x30
[<c046ef52>] __fput+0xad/0x15b
[<c046f1d9>] fput+0x17/0x19
[<c046c8c4>] filp_close+0x50/0x5a
[<c046da06>] sys_close+0x69/0x9f
[<c04048ce>] syscall_call+0x7/0xb
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/pppol2tp.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/net/pppol2tp.c b/drivers/net/pppol2tp.c index 383c32f5309..f0a5ea374eb 100644 --- a/drivers/net/pppol2tp.c +++ b/drivers/net/pppol2tp.c @@ -1279,6 +1279,7 @@ out: static int pppol2tp_release(struct socket *sock) { struct sock *sk = sock->sk; + struct pppol2tp_session *session; int error; if (!sk) @@ -1296,9 +1297,18 @@ static int pppol2tp_release(struct socket *sock) sock_orphan(sk); sock->sk = NULL; + session = pppol2tp_sock_to_session(sk); + /* Purge any queued data */ skb_queue_purge(&sk->sk_receive_queue); skb_queue_purge(&sk->sk_write_queue); + if (session != NULL) { + struct sk_buff *skb; + while ((skb = skb_dequeue(&session->reorder_q))) { + kfree_skb(skb); + sock_put(sk); + } + } release_sock(sk); |