geneve: use the correct nlattr array in NL_SET_ERR_MSG_ATTR

geneve: use the correct nlattr array in NL_SET_ERR_MSG_ATTR

BugLink: https://bugs.launchpad.net/bugs/1876361
[ Upstream commit 9a7b5b50de8a764671ba1800fe4c52d3b7013901 ]

IFLA_GENEVE_* attributes are in the data array, which is correctly
used when fetching the value, but not when setting the extended
ack. Because IFLA_GENEVE_MAX < IFLA_MAX, we avoid out of bounds
array accesses, but we don't provide a pointer to the invalid
attribute to userspace.

Fixes: a025fb5f49ad ("geneve: Allow configuration of DF behaviour")
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>