linux-kernel - [PATCH 3.16 164/212] vxlan: correctly validate VXLAN ID against VXLAN_N

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Message-ID: <lsq.1496331796.700589273@decadent.org.uk>
Date:   Thu, 01 Jun 2017 16:43:16 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Matthias Schiffer" <mschiffer@...verse-factory.net>,
        "Jiri Benc" <jbenc@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 164/212] vxlan: correctly validate VXLAN ID against
 VXLAN_N_VID

3.16.44-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Matthias Schiffer <mschiffer@...verse-factory.net>

commit 4e37d6911f36545b286d15073f6f2222f840e81c upstream.

The incorrect check caused an off-by-one error: the maximum VID 0xffffff
was unusable.

Fixes: d342894c5d2f ("vxlan: virtual extensible lan")
Signed-off-by: Matthias Schiffer <mschiffer@...verse-factory.net>
Acked-by: Jiri Benc <jbenc@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/vxlan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -2326,7 +2326,7 @@ static int vxlan_validate(struct nlattr
 
 	if (data[IFLA_VXLAN_ID]) {
 		__u32 id = nla_get_u32(data[IFLA_VXLAN_ID]);
-		if (id >= VXLAN_VID_MASK)
+		if (id >= VXLAN_N_VID)
 			return -ERANGE;
 	}