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From: KarimAllah Ahmed <karahmed@amazon.de>
To: "Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	kvm@vger.kernel.org
Cc: KarimAllah Ahmed <karahmed@amazon.de>
Subject: [PATCH] KVM: Properly check if "page" is valid in kvm_vcpu_unmap
Date: Wed, 10 Jul 2019 11:13:13 +0200	[thread overview]
Message-ID: <1562749993-12840-1-git-send-email-karahmed@amazon.de> (raw)

The field "page" is initialized to KVM_UNMAPPED_PAGE when it is not used
(i.e. when the memory lives outside kernel control). So this check will
always end up using kunmap even for memremap regions.

Fixes: e45adf665a53 ("KVM: Introduce a new guest mapping API")
Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de>
---
 virt/kvm/kvm_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 2f2d24a..e629766 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1790,7 +1790,7 @@ void kvm_vcpu_unmap(struct kvm_vcpu *vcpu, struct kvm_host_map *map,
 	if (!map->hva)
 		return;
 
-	if (map->page)
+	if (map->page != KVM_UNMAPPED_PAGE)
 		kunmap(map->page);
 #ifdef CONFIG_HAS_IOMEM
 	else
-- 
2.7.4


             reply	other threads:[~2019-07-10  9:13 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-10  9:13 KarimAllah Ahmed [this message]
2019-07-10 14:25 ` [PATCH] KVM: Properly check if "page" is valid in kvm_vcpu_unmap Paolo Bonzini

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