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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: ee122c79d4 ("vxlan: Flow based tunneling")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2019-10-29 01:24:32 +08:00 committed by David S. Miller
parent 2eb8d6d291
commit eadf52cf18
1 changed files with 4 additions and 2 deletions
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6
drivers/net/vxlan.c
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@ -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;