This is a bug fix; Setting an authenticated variable may fail due to
a memory corruption in the authentication.
A temporary buffer will, if needed, be allocated to parse a variable's
authentication data, and some portion of buffer, specifically signer's
certificates, will be referenced by efi_signature_verify().
So the buffer should be kept valid until the authentication process
is finished.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
0658bb29b0