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authorXin Long <lucien.xin@gmail.com>2019-10-28 18:19:35 +0300
committerDavid S. Miller <davem@davemloft.net>2019-10-30 03:36:42 +0300
commit2eb8d6d2910cfe3dc67dc056f26f3dd9c63d47cd (patch)
tree5490ad73490d3235a4da373fe744a0a9f8087951 /net/ipv4
parente56bd641ca61beb92b135298d5046905f920b734 (diff)
downloadlinux-2eb8d6d2910cfe3dc67dc056f26f3dd9c63d47cd.tar.xz
erspan: fix the tun_info options_len check for erspan
The check for !md doens't really work for ip_tunnel_info_opts(info) which only does info + 1. Also to avoid out-of-bounds access on info, it should ensure options_len is not less than erspan_metadata in both erspan_xmit() and ip6erspan_tunnel_xmit(). Fixes: 1a66a836da ("gre: add collect_md mode to ERSPAN tunnel") Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/ip_gre.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 52690bb3e40f..10636fb6093e 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -509,9 +509,9 @@ static void erspan_fb_xmit(struct sk_buff *skb, struct net_device *dev)
key = &tun_info->key;
if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
goto err_free_skb;
- md = ip_tunnel_info_opts(tun_info);
- if (!md)
+ if (tun_info->options_len < sizeof(*md))
goto err_free_skb;
+ md = ip_tunnel_info_opts(tun_info);
/* ERSPAN has fixed 8 byte GRE header */
version = md->version;