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[20/30] KVM: MMU: Fix another largepage memory leak

Message ID 1235785309-12835-21-git-send-email-avi@redhat.com (mailing list archive)
State Accepted, archived
Headers show

Commit Message

Avi Kivity Feb. 28, 2009, 1:41 a.m. UTC 
From: Joerg Roedel <joerg.roedel@amd.com>

In the paging_fetch function rmap_remove is called after setting a large
pte to non-present. This causes rmap_remove to not drop the reference to
the large page. The result is a memory leak of that page.

Cc: stable@kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Acked-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---
 arch/x86/kvm/paging_tmpl.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
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Patch

diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 7314c09..0f11792 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -306,9 +306,9 @@  static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
 			continue;
 
 		if (is_large_pte(*sptep)) {
+			rmap_remove(vcpu->kvm, sptep);
 			set_shadow_pte(sptep, shadow_trap_nonpresent_pte);
 			kvm_flush_remote_tlbs(vcpu->kvm);
-			rmap_remove(vcpu->kvm, sptep);
 		}
 
 		if (level == PT_DIRECTORY_LEVEL