Commit 0ff77873 authored by Marcelo Tosatti's avatar Marcelo Tosatti Committed by Avi Kivity
Browse files

KVM: PIT: fix kpit_elapsed division by zero 



Fix division by zero triggered by latch count command on uninitialized
counter.

Cc: stable@kernel.org
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent e125e7b6

arch/x86/kvm/i8254.c

+3 −0
Original line number Original line Diff line number Diff line
@@ -104,6 +104,9 @@ static s64 __kpit_elapsed(struct kvm *kvm) 
	ktime_t remaining;

	ktime_t remaining;

	struct kvm_kpit_state *ps = &kvm->arch.vpit->pit_state;

	struct kvm_kpit_state *ps = &kvm->arch.vpit->pit_state;





	if (!ps->pit_timer.period)

		return 0;



	/*

	/*

	 * The Counter does not stop when it reaches zero. In

	 * The Counter does not stop when it reaches zero. In

	 * Modes 0, 1, 4, and 5 the Counter ``wraps around'' to

	 * Modes 0, 1, 4, and 5 the Counter ``wraps around'' to