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KVM: MMU: Fix potential memory leak with smp real-mode

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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>
This commit is contained in:
Izik Eidus 2007-11-20 11:30:04 +02:00 committed by Avi Kivity
parent 2d2a7b9cff
commit 2065b3727e
1 changed files with 3 additions and 1 deletions
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4
drivers/kvm/mmu.c
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@ -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 |