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| author | Xin Long <lucien.xin@gmail.com> | 2019-10-28 18:19:35 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-10-30 03:36:42 +0300 |
| commit | 2eb8d6d2910cfe3dc67dc056f26f3dd9c63d47cd (patch) | |
| tree | 5490ad73490d3235a4da373fe744a0a9f8087951 | |
| parent | e56bd641ca61beb92b135298d5046905f920b734 (diff) | |
| download | linux-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>
| -rw-r--r-- | net/ipv4/ip_gre.c | 4 | ||||
| -rw-r--r-- | net/ipv6/ip6_gre.c | 4 |
2 files changed, 4 insertions, 4 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; diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c index 787d9f2a6e99..923034c52ce4 100644 --- a/net/ipv6/ip6_gre.c +++ b/net/ipv6/ip6_gre.c @@ -980,9 +980,9 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb, dsfield = key->tos; if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT)) goto tx_err; - md = ip_tunnel_info_opts(tun_info); - if (!md) + if (tun_info->options_len < sizeof(*md)) goto tx_err; + md = ip_tunnel_info_opts(tun_info); tun_id = tunnel_id_to_key32(key->tun_id); if (md->version == 1) { |