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authorMarcelo Tosatti <mtosatti@redhat.com>2009-07-02 20:02:15 -0300
committerAvi Kivity <avi@redhat.com>2009-08-05 13:58:11 +0300
commit0ff77873b1318fc2d77a85e70690d3cd6cafbd41 (patch)
treecb08f8c862a445477aae5a74cb087302336d26e4 /arch
parente125e7b6944898831b56739a5448e705578bf7e2 (diff)
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: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/i8254.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index 4d6f0d293ee2..21f68e00524f 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -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