Description: KVM: x86: fix out-of-bounds write in KVM_GET_EMULATED_CPUID
References:
 https://lore.kernel.org/kvm/000000000000ea5ec20598d90e50@google.com/
 https://www.openwall.com/lists/oss-security/2019/12/16/1
Notes:
 carnil> Fixed as well in 5.4.3 and 5.3.16 already.
Bugs:
upstream: released (5.5-rc1) [433f4ba1904100da65a311033f17a9bf586b287e]
4.19-upstream-stable: released (4.19.89) [5119ffd480b644d8bc9af741cc8ef435a7ec5ff7]
4.9-upstream-stable: released (4.9.207) [8b587e3f1424fae01f9c7e78d8d294bcb71f6f41]
3.16-upstream-stable: released (3.16.79) [21377f88c2757c6ee3e28407fb1c44b4bdf7e6b2]
sid: released (5.4.6-1)
4.19-buster-security: released (4.19.98-1)
4.9-stretch-security: released (4.9.210-1)
3.16-jessie-security: released (3.16.81-1)