kaiser: fix unlikely error in alloc_ldt_struct()
An error from kaiser_add_mapping() here is not at all likely, but Eric Biggers rightly points out that __free_ldt_struct() relies on new_ldt->size being initialized: move that up. Acked-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> CVE-2017-5754 Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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