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authorGuillaume Nault <g.nault@alphalink.fr>2017-08-25 16:51:42 +0200
committerDavid S. Miller <davem@davemloft.net>2017-08-28 11:34:58 -0700
commitbb0a32ce4389e17e47e198d2cddaf141561581ad (patch)
tree9da4476f4f4c705441368f0d4c0c4a9edb7b2c74 /net/l2tp/l2tp_netlink.c
parentl2tp: hold tunnel while looking up sessions in l2tp_netlink (diff)
downloadlinux-dev-bb0a32ce4389e17e47e198d2cddaf141561581ad.tar.xz
linux-dev-bb0a32ce4389e17e47e198d2cddaf141561581ad.zip
l2tp: hold tunnel while processing genl delete command
l2tp_nl_cmd_tunnel_delete() needs to take a reference on the tunnel, to prevent it from being concurrently freed by l2tp_tunnel_destruct(). Fixes: 309795f4bec2 ("l2tp: Add netlink control API for L2TP") Signed-off-by: Guillaume Nault <g.nault@alphalink.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/l2tp/l2tp_netlink.c')
-rw-r--r--net/l2tp/l2tp_netlink.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/l2tp/l2tp_netlink.c b/net/l2tp/l2tp_netlink.c
index 27ee94b5c189..808966550620 100644
--- a/net/l2tp/l2tp_netlink.c
+++ b/net/l2tp/l2tp_netlink.c
@@ -273,8 +273,8 @@ static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info
}
tunnel_id = nla_get_u32(info->attrs[L2TP_ATTR_CONN_ID]);
- tunnel = l2tp_tunnel_find(net, tunnel_id);
- if (tunnel == NULL) {
+ tunnel = l2tp_tunnel_get(net, tunnel_id);
+ if (!tunnel) {
ret = -ENODEV;
goto out;
}
@@ -284,6 +284,8 @@ static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info
(void) l2tp_tunnel_delete(tunnel);
+ l2tp_tunnel_dec_refcount(tunnel);
+
out:
return ret;
}