diff options
| author | Guillaume Nault <g.nault@alphalink.fr> | 2017-03-29 09:44:59 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-03-29 19:26:28 +0300 |
| commit | 94d7ee0baa8b764cf64ad91ed69464c1a6a0066b (patch) | |
| tree | 03e6f31158e3e4da7163606af6729383013a7a48 /net/l2tp | |
| parent | b768b16de58d5e0b1d7c3f936825b25327ced20c (diff) | |
| download | linux-94d7ee0baa8b764cf64ad91ed69464c1a6a0066b.tar.xz | |
l2tp: hold tunnel socket when handling control frames in l2tp_ip and l2tp_ip6
The code following l2tp_tunnel_find() expects that a new reference is
held on sk. Either sk_receive_skb() or the discard_put error path will
drop a reference from the tunnel's socket.
This issue exists in both l2tp_ip and l2tp_ip6.
Fixes: a3c18422a4b4 ("l2tp: hold socket before dropping lock in l2tp_ip{, 6}_recv()")
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/l2tp')
| -rw-r--r-- | net/l2tp/l2tp_ip.c | 5 | ||||
| -rw-r--r-- | net/l2tp/l2tp_ip6.c | 5 |
2 files changed, 6 insertions, 4 deletions
diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c index d25038cfd64e..7208fbe5856b 100644 --- a/net/l2tp/l2tp_ip.c +++ b/net/l2tp/l2tp_ip.c @@ -178,9 +178,10 @@ pass_up: tunnel_id = ntohl(*(__be32 *) &skb->data[4]); tunnel = l2tp_tunnel_find(net, tunnel_id); - if (tunnel != NULL) + if (tunnel) { sk = tunnel->sock; - else { + sock_hold(sk); + } else { struct iphdr *iph = (struct iphdr *) skb_network_header(skb); read_lock_bh(&l2tp_ip_lock); diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c index a4abcbc4c09a..516d7ce24ba7 100644 --- a/net/l2tp/l2tp_ip6.c +++ b/net/l2tp/l2tp_ip6.c @@ -191,9 +191,10 @@ pass_up: tunnel_id = ntohl(*(__be32 *) &skb->data[4]); tunnel = l2tp_tunnel_find(net, tunnel_id); - if (tunnel != NULL) + if (tunnel) { sk = tunnel->sock; - else { + sock_hold(sk); + } else { struct ipv6hdr *iph = ipv6_hdr(skb); read_lock_bh(&l2tp_ip6_lock); |