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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Xin Long <lucien.xin@gmail.com>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.19 39/79] erspan: fix the tun_info options_len check for erspan
Date:   Fri,  8 Nov 2019 19:50:19 +0100
Message-Id: <20191108174808.812916068@linuxfoundation.org>
In-Reply-To: <20191108174745.495640141@linuxfoundation.org>
References: <20191108174745.495640141@linuxfoundation.org>
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From: Xin Long <lucien.xin@gmail.com>

[ Upstream commit 2eb8d6d2910cfe3dc67dc056f26f3dd9c63d47cd ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv4/ip_gre.c  |    4 ++--
 net/ipv6/ip6_gre.c |    4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -589,9 +589,9 @@ static void erspan_fb_xmit(struct sk_buf
 	key = &tun_info->key;
 	if (!(tun_info->key.tun_flags & TUNNEL_ERSPAN_OPT))
 		goto err_free_rt;
+	if (tun_info->options_len < sizeof(*md))
+ 		goto err_free_rt;
 	md = ip_tunnel_info_opts(tun_info);
-	if (!md)
-		goto err_free_rt;
 
 	/* ERSPAN has fixed 8 byte GRE header */
 	version = md->version;
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -1000,9 +1000,9 @@ static netdev_tx_t ip6erspan_tunnel_xmit
 		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) {