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vxlan: correctly validate VXLAN ID against VXLAN_N_VID

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[ Upstream commit 4e37d6911f36545b286d15073f6f2222f840e81c ]

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@universe-factory.net>
Acked-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Matthias Schiffer 2017-02-23 17:19:41 +01:00 committed by Greg Kroah-Hartman
parent 0c6e38e791
commit ee2da79de2
1 changed files with 1 additions and 1 deletions
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2
drivers/net/vxlan.c
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@ -2637,7 +2637,7 @@ 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;
}