Commit eadf52cf authored by Xin Long's avatar Xin Long Committed by David S. Miller

vxlan: check tun_info options_len properly

This patch is to improve the tun_info options_len by dropping
the skb when TUNNEL_VXLAN_OPT is set but options_len is less
than vxlan_metadata. This can void a potential out-of-bounds
access on ip_tun_info.

Fixes: ee122c79 ("vxlan: Flow based tunneling")
Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 2eb8d6d2
......@@ -2487,9 +2487,11 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
vni = tunnel_id_to_key32(info->key.tun_id);
ifindex = 0;
dst_cache = &info->dst_cache;
if (info->options_len &&
info->key.tun_flags & TUNNEL_VXLAN_OPT)
if (info->key.tun_flags & TUNNEL_VXLAN_OPT) {
if (info->options_len < sizeof(*md))
goto drop;
md = ip_tunnel_info_opts(info);
}
ttl = info->key.ttl;
tos = info->key.tos;
label = info->key.label;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment