shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-07 03:15:31 +09:00
Code Issues Packages Projects Releases Wiki Activity

vxlan: check tun_info options_len properly

Browse Source 
[ Upstream commit eadf52cf18 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xin Long
2019-10-29 01:24:32 +08:00
committed by Chris
parent aff211b0a2
commit bc936fad9b
1 changed files with 4 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/net/vxlan.c
View File

@@ -2049,8 +2049,11 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
label = info->key.label;
udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
if (info->options_len)
if (info->options_len) {
if (info->options_len < sizeof(*md))
goto drop;
md = ip_tunnel_info_opts(info);
}
} else {
md->gbp = skb->mark;
}