diff options
| author | Paul Hüber <phueber@kernsp.in> | 2017-02-26 17:58:19 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-22 12:04:14 +0100 |
| commit | 2cd0afc64e333f2ef62444300418883cff0e79da (patch) | |
| tree | 47f8c6a3693a9f50aff5d8112a357b9c15606deb /net | |
| parent | 354f79125f12bcd7352704e770c0b10c4a4b424e (diff) | |
l2tp: avoid use-after-free caused by l2tp_ip_backlog_recv
[ Upstream commit 51fb60eb162ab84c5edf2ae9c63cf0b878e5547e ]
l2tp_ip_backlog_recv may not return -1 if the packet gets dropped.
The return value is passed up to ip_local_deliver_finish, which treats
negative values as an IP protocol number for resubmission.
Signed-off-by: Paul Hüber <phueber@kernsp.in>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/l2tp/l2tp_ip.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c index 445b7cd0826a..48ab93842322 100644 --- a/net/l2tp/l2tp_ip.c +++ b/net/l2tp/l2tp_ip.c @@ -383,7 +383,7 @@ static int l2tp_ip_backlog_recv(struct sock *sk, struct sk_buff *skb) drop: IP_INC_STATS(sock_net(sk), IPSTATS_MIB_INDISCARDS); kfree_skb(skb); - return -1; + return 0; } /* Userspace will call sendmsg() on the tunnel socket to send L2TP |