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authorIzik Eidus <izike@qumranet.com>2007-11-20 11:30:04 +0200
committerAvi Kivity <avi@qumranet.com>2008-01-30 17:53:08 +0200
commit2065b3727ecdb64450597d70f7e13af00b85dbd8 (patch)
treecbfcc78359c7738ee748569bbc6eec39f17a8784 /drivers/kvm/mmu.c
parent2d2a7b9cff7f6324e69daa3ab76799641a94a0e8 (diff)
downloadop-kernel-dev-2065b3727ecdb64450597d70f7e13af00b85dbd8.zip
op-kernel-dev-2065b3727ecdb64450597d70f7e13af00b85dbd8.tar.gz
KVM: MMU: Fix potential memory leak with smp real-mode
When we map a page, we check whether some other vcpu mapped it for us and if so, bail out. But we should decrease the refcount on the page as we do so. Signed-off-by: Izik Eidus <izike@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
Diffstat (limited to 'drivers/kvm/mmu.c')
-rw-r--r--drivers/kvm/mmu.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index 87d8e70..8add4d5 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -907,8 +907,10 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, hpa_t p)
pte = table[index];
was_rmapped = is_rmap_pte(pte);
- if (is_shadow_present_pte(pte) && is_writeble_pte(pte))
+ if (is_shadow_present_pte(pte) && is_writeble_pte(pte)) {
+ kvm_release_page(pfn_to_page(p >> PAGE_SHIFT));
return 0;
+ }
mark_page_dirty(vcpu->kvm, v >> PAGE_SHIFT);
page_header_update_slot(vcpu->kvm, table, v);
table[index] = p | PT_PRESENT_MASK | PT_WRITABLE_MASK |
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