tree 63bebe3b669b051526b608e50db1fbdc4c753d94
parent 95e2a3b3ef177730019e3799917193595133b275
author Yu Zhang <yu.c.zhang@linux.intel.com> 1505731501 +0800
committer Radim Krčmář <rkrcmar@redhat.com> 1505824138 +0200

KVM: x86: Fix the NULL pointer parameter in check_cr_write()

Routine check_cr_write() will trigger emulator_get_cpuid()->
kvm_cpuid() to get maxphyaddr, and NULL is passed as values
for ebx/ecx/edx. This is problematic because kvm_cpuid() will
dereference these pointers.

Fixes: d1cd3ce90044 ("KVM: MMU: check guest CR3 reserved bits based on its physical address width.")
Reported-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Yu Zhang <yu.c.zhang@linux.intel.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>