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authorJames Chapman <jchapman@katalix.com>2012-01-25 06:39:05 +0400
committerDavid S. Miller <davem@davemloft.net>2012-01-26 06:45:00 +0400
commit68315801dbf3ab2001679fd2074c9dc5dcf87dfa (patch)
tree24e7989e852b6a32f2fd980d1b6958720175f7dc /net/l2tp
parent701b259f446be2f3625fb852bceb93afe76e206d (diff)
downloadlinux-68315801dbf3ab2001679fd2074c9dc5dcf87dfa.tar.xz
l2tp: l2tp_ip - fix possible oops on packet receive
When a packet is received on an L2TP IP socket (L2TPv3 IP link encapsulation), the l2tpip socket's backlog_rcv function calls xfrm4_policy_check(). This is not necessary, since it was called before the skb was added to the backlog. With CONFIG_NET_NS enabled, xfrm4_policy_check() will oops if skb->dev is null, so this trivial patch removes the call. This bug has always been present, but only when CONFIG_NET_NS is enabled does it cause problems. Most users are probably using UDP encapsulation for L2TP, hence the problem has only recently surfaced. EIP: 0060:[<c12bb62b>] EFLAGS: 00210246 CPU: 0 EIP is at l2tp_ip_recvmsg+0xd4/0x2a7 EAX: 00000001 EBX: d77b5180 ECX: 00000000 EDX: 00200246 ESI: 00000000 EDI: d63cbd30 EBP: d63cbd18 ESP: d63cbcf4 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 Call Trace: [<c1218568>] sock_common_recvmsg+0x31/0x46 [<c1215c92>] __sock_recvmsg_nosec+0x45/0x4d [<c12163a1>] __sock_recvmsg+0x31/0x3b [<c1216828>] sock_recvmsg+0x96/0xab [<c10b2693>] ? might_fault+0x47/0x81 [<c10b2693>] ? might_fault+0x47/0x81 [<c1167fd0>] ? _copy_from_user+0x31/0x115 [<c121e8c8>] ? copy_from_user+0x8/0xa [<c121ebd6>] ? verify_iovec+0x3e/0x78 [<c1216604>] __sys_recvmsg+0x10a/0x1aa [<c1216792>] ? sock_recvmsg+0x0/0xab [<c105a99b>] ? __lock_acquire+0xbdf/0xbee [<c12d5a99>] ? do_page_fault+0x193/0x375 [<c10d1200>] ? fcheck_files+0x9b/0xca [<c10d1259>] ? fget_light+0x2a/0x9c [<c1216bbb>] sys_recvmsg+0x2b/0x43 [<c1218145>] sys_socketcall+0x16d/0x1a5 [<c11679f0>] ? trace_hardirqs_on_thunk+0xc/0x10 [<c100305f>] sysenter_do_call+0x12/0x38 Code: c6 05 8c ea a8 c1 01 e8 0c d4 d9 ff 85 f6 74 07 3e ff 86 80 00 00 00 b9 17 b6 2b c1 ba 01 00 00 00 b8 78 ed 48 c1 e8 23 f6 d9 ff <ff> 76 0c 68 28 e3 30 c1 68 2d 44 41 c1 e8 89 57 01 00 83 c4 0c Signed-off-by: James Chapman <jchapman@katalix.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/l2tp')
-rw-r--r--net/l2tp/l2tp_ip.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
index d21e7ebd91ca..55670ec3cd0f 100644
--- a/net/l2tp/l2tp_ip.c
+++ b/net/l2tp/l2tp_ip.c
@@ -393,11 +393,6 @@ static int l2tp_ip_backlog_recv(struct sock *sk, struct sk_buff *skb)
{
int rc;
- if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
- goto drop;
-
- nf_reset(skb);
-
/* Charge it to the socket, dropping if the queue is full. */
rc = sock_queue_rcv_skb(sk, skb);
if (rc < 0)