[stable] KVM: x86: fix out-of-bounds write in KVM_GET_EMULATED_CPUID (CVE-2019-19332)

[Ben Hutchings <ben@xxxxxxxxxxxxxxx>]

Please pick:

commit 433f4ba1904100da65a311033f17a9bf586b287e
Author: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date:   Wed Dec 4 10:28:54 2019 +0100

    KVM: x86: fix out-of-bounds write in KVM_GET_EMULATED_CPUID (CVE-2019-19332)

for all stable branches.

Ben.

-- 
Ben Hutchings
The generation of random numbers is too important to be left to chance.
                                                       - Robert Coveyou

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