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| author | James Chapman <jchapman@katalix.com> | 2008-06-04 15:07:32 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-06-04 15:07:32 -0700 |
| commit | 199f7d24ae59894243687a234a909f44a8724506 (patch) | |
| tree | 396efe66b51628fc0077de74b00c66957cd1f58d /drivers/net/pppol2tp.c | |
| parent | b4496d44c6bd8b2da8d370ef49c4b008ce82370b (diff) | |
| download | linux-199f7d24ae59894243687a234a909f44a8724506.tar.gz | |
lt2p: Fix possible WARN_ON from socket code when UDP socket is closed
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>
Diffstat (limited to 'drivers/net/pppol2tp.c')
| -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 8db342f2fdc9..04c7e5b407fd 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); |