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| author | Paul Hüber <phueber@kernsp.in> | 2017-02-26 17:58:19 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-02-26 22:57:17 -0500 |
| commit | 51fb60eb162ab84c5edf2ae9c63cf0b878e5547e (patch) | |
| tree | 388f0a7c4f8d7920de303e3cadb4e7526f26c06a /net/l2tp/l2tp_ip.c | |
| parent | 1ecc9ad02c3d4cf44bc94bffcb3b12e7861b00a7 (diff) | |
| download | linux-51fb60eb162ab84c5edf2ae9c63cf0b878e5547e.tar.gz linux-51fb60eb162ab84c5edf2ae9c63cf0b878e5547e.tar.bz2 linux-51fb60eb162ab84c5edf2ae9c63cf0b878e5547e.zip | |
l2tp: avoid use-after-free caused by l2tp_ip_backlog_recv
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>
Diffstat (limited to 'net/l2tp/l2tp_ip.c')
| -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 c59712057dc8..d25038cfd64e 100644 --- a/net/l2tp/l2tp_ip.c +++ b/net/l2tp/l2tp_ip.c @@ -388,7 +388,7 @@ 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 |