Commit f0367ee1 authored May 18, 2017 by Radim Krčmář

KVM: x86: zero base3 of unusable segments



Static checker noticed that base3 could be used uninitialized if the
segment was not present (useable).  Random stack values probably would
not pass VMCS entry checks.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: 1aa36616 ("KVM: x86 emulator: consolidate segment accessors")
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

parent cbfc6c91

arch/x86/kvm/x86.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -5067,6 +5067,8 @@ static bool emulator_get_segment(struct x86_emulate_ctxt ctxt, u16 selector,

		if (var.unusable) {
		memset(desc, 0, sizeof(*desc));
		if (base3)
		*base3 = 0;
		return false;
		}