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Commit 378a8b09 authored by Gleb Natapov's avatar Gleb Natapov Committed by Marcelo Tosatti
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KVM: x86: fix use of uninitialized memory as segment descriptor in emulator. 



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: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 91b0aa2c

arch/x86/kvm/x86.c

+3 −1
Original line number Diff line number Diff line
@@ -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;