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[PATCH] kvm: fix vcpu freeing bug

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vcpu_load() can return NULL and it sometimes does in failure paths (for
example when the userspace ABI version is too old) - causing a preemption
count underflow in the ->vcpu_free() later on.  So check for NULL.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ingo Molnar 2007-02-12 00:54:42 -08:00 committed by Linus Torvalds
parent 8cd133073f
commit 1e8ba6fba5
1 changed files with 3 additions and 1 deletions
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4
drivers/kvm/kvm_main.c
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@ -272,7 +272,9 @@ static void kvm_free_physmem(struct kvm *kvm)
static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
{
vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
if (!vcpu_load(vcpu->kvm, vcpu_slot(vcpu)))
return;
kvm_mmu_destroy(vcpu);
vcpu_put(vcpu);
kvm_arch_ops->vcpu_free(vcpu);