vxlan: use the correct nlattr array in NL_SET_ERR_MSG_ATTR
IFLA_VXLAN_* attributes are in the data array, which is correctly used when fetching the value, but not when setting the extended ack. Because IFLA_VXLAN_MAX < IFLA_MAX, we avoid out of bounds array accesses, but we don't provide a pointer to the invalid attribute to userspace. Fixes: 653ef6a3 ("vxlan: change vxlan_[config_]validate() to use netlink_ext_ack for error reporting") Fixes: b4d30697 ("vxlan: Allow configuration of DF behaviour") Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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