From: Wei Yongjun <yjwei@cn.fujitsu.com>
Date: Tue, 17 Aug 2010 02:08:52 +0000 (+0800)
Subject: KVM: PPC: fix leakage of error page in kvmppc_patch_dcbz()
X-Git-Tag: firefly_0821_release~7613^2~3665^2~207
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=646bab55a278ceb1cf43b1f80d3dd468be62a421;p=firefly-linux-kernel-4.4.55.git

KVM: PPC: fix leakage of error page in kvmppc_patch_dcbz()

Add kvm_release_page_clean() after is_error_page() to avoid
leakage of error page.

Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
---

diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index eee97b5a7400..7656b6df0d8b 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -455,8 +455,10 @@ static void kvmppc_patch_dcbz(struct kvm_vcpu *vcpu, struct kvmppc_pte *pte)
 	int i;
 
 	hpage = gfn_to_page(vcpu->kvm, pte->raddr >> PAGE_SHIFT);
-	if (is_error_page(hpage))
+	if (is_error_page(hpage)) {
+		kvm_release_page_clean(hpage);
 		return;
+	}
 
 	hpage_offset = pte->raddr & ~PAGE_MASK;
 	hpage_offset &= ~0xFFFULL;