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KVM: PIT: fix kpit_elapsed division by zero

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

Cc: stable@kernel.org
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti 2009-07-02 20:02:15 -03:00 committed by Avi Kivity
parent e125e7b694
commit 0ff77873b1
1 changed files with 3 additions and 0 deletions
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3
arch/x86/kvm/i8254.c
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@ -104,6 +104,9 @@ static s64 __kpit_elapsed(struct kvm *kvm)
ktime_t remaining;
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
* Modes 0, 1, 4, and 5 the Counter ``wraps around'' to