KVM: x86: Harden copying of userspace-array against overflow

cpuid.c utilizes vmemdup_user() and array_size() to copy two userspace
arrays. This, currently, does not check for an overflow.

Use the new wrapper vmemdup_array_user() to copy the arrays more safely,
as vmemdup_user() doesn't check for overflow.

Note, KVM explicitly checks the number of entries before duplicating the
array, i.e. adding the overflow check should be a glorified nop.

Suggested-by: Dave Airlie <[email protected]>
Signed-off-by: Philipp Stanner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[sean: call out that KVM pre-checks the number of entries]
Signed-off-by: Sean Christopherson <[email protected]>

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