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| author | Ingo Molnar <mingo@elte.hu> | 2007-02-12 00:54:42 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-02-12 09:48:40 -0800 |
| commit | 1e8ba6fba5050ec11bba90c8622aa2ed95ff711f (patch) | |
| tree | 4dfc7c1c8a6119648978f25c1065b344123638cb | |
| parent | 8cd133073f9b5cd335c0b2e4740aceb025d50ca9 (diff) | |
| download | linux-1e8ba6fba5050ec11bba90c8622aa2ed95ff711f.tar.bz2 | |
[PATCH] kvm: fix vcpu freeing bug
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>
| -rw-r--r-- | drivers/kvm/kvm_main.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index eb3931ca680a..9b79d3451f6f 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -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); |