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vxlan: fix incorrect nlattr access in MTU check 

The access to the wrong variable could lead to a NULL dereference and
possibly other invalid memory reads in vxlan newlink/changelink requests
with a IFLA_MTU attribute.

Fixes: a985343ba9 "vxlan: refactor verification and application of configuration"
Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matthias Schiffer 2017-06-27 14:42:43 +02:00 committed by David S. Miller
parent c017ce0a9a
commit 019b13ae85
1 changed files with 1 additions and 1 deletions
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2
drivers/net/vxlan.c
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@ -2727,7 +2727,7 @@ static int vxlan_validate(struct nlattr *tb[], struct nlattr *data[],
}
if (tb[IFLA_MTU]) {
u32 mtu = nla_get_u32(data[IFLA_MTU]);
u32 mtu = nla_get_u32(tb[IFLA_MTU]);
if (mtu < ETH_MIN_MTU || mtu > ETH_MAX_MTU)
return -EINVAL;