linux-kernel - [PATCH 3.10 169/250] vxlan: correctly validate VXLAN ID against VXLAN_N

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Message-Id: <1496876436-32402-170-git-send-email-w@1wt.eu>
Date:   Thu,  8 Jun 2017 00:59:15 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Matthias Schiffer <mschiffer@...verse-factory.net>,
        "David S . Miller" <davem@...emloft.net>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 169/250] vxlan: correctly validate VXLAN ID against VXLAN_N_VID

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: Willy Tarreau <w@....eu>
---
 drivers/net/vxlan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index a1dc186..8912ba8 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1386,7 +1386,7 @@ static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[])
 
 	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;
 	}
 
-- 
2.8.0.rc2.1.gbe9624a