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KVM: x86: fix use of uninitialized memory as segment descriptor in emulator.

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If VMX reports segment as unusable, zero descriptor passed by the emulator
before returning. Such descriptor will be considered not present by the
emulator.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Gleb Natapov 2013-01-21 15:36:48 +02:00 committed by Marcelo Tosatti
parent 91b0aa2ca6
commit 378a8b099f
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kvm/x86.c
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@ -4489,8 +4489,10 @@ static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector,
kvm_get_segment(emul_to_vcpu(ctxt), &var, seg);
*selector = var.selector;
if (var.unusable)
if (var.unusable) {
memset(desc, 0, sizeof(*desc));
return false;
}
if (var.g)
var.limit >>= 12;