virtio-crypto: fix possible integer and heap overflow

virtio-crypto: fix possible integer and heap overflow

Because the 'size_t' type is 4 bytes in 32-bit platform, which
is the same with 'int'. It's easy to make 'max_len' to zero when
integer overflow and then cause heap overflow if 'max_len' is zero.

Using uint_64 instead of size_t to avoid the integer overflow.

Cc: [email protected]
Reported-by: Li Qiang <[email protected]>
Signed-off-by: Gonglei <[email protected]>
Tested-by: Li Qiang <[email protected]>
Reviewed-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>