linux-kernel - [PATCH] kvm: fix coalesced

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Message-ID: <20090527164059.23966.75880.stgit@dev.haskins.net>
Date:	Wed, 27 May 2009 12:41:12 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	avi@...hat.com
Cc:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] kvm: fix coalesced_mmio leak on shutdown

It would appear that we are invoking kfree() on the wrong pointer in the
destructor for the coalesced_mmio device.  This would result in a potential
leak during shutdown.

Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
---

 virt/kvm/coalesced_mmio.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/virt/kvm/coalesced_mmio.c b/virt/kvm/coalesced_mmio.c
index 5ae620d..03ea280 100644
--- a/virt/kvm/coalesced_mmio.c
+++ b/virt/kvm/coalesced_mmio.c
@@ -80,7 +80,10 @@ static void coalesced_mmio_write(struct kvm_io_device *this,
 
 static void coalesced_mmio_destructor(struct kvm_io_device *this)
 {
-	kfree(this);
+	struct kvm_coalesced_mmio_dev *dev =
+		(struct kvm_coalesced_mmio_dev *)this->private;
+
+	kfree(dev);
 }
 
 int kvm_coalesced_mmio_init(struct kvm *kvm)

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