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virtio_pci: fix use after free on release

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KASan detected a use-after-free error in virtio-pci remove code. In
virtio_pci_remove(), vp_dev is still used after being freed in
unregister_virtio_device() (in virtio_pci_release_dev() more
precisely).

To fix, keep a reference until cleanup is done.

Fixes: 63bd62a08c ("virtio_pci: defer kfree until release callback")
Reported-by: Jerome Marchand <jmarchan@redhat.com>
Cc: stable@vger.kernel.org
Cc: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Jerome Marchand <jmarchan@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2016-01-14 16:00:41 +02:00
parent 92e963f50f
commit 2989be09a8
1 changed files with 2 additions and 0 deletions
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2
drivers/virtio/virtio_pci_common.c
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@ -545,6 +545,7 @@ static int virtio_pci_probe(struct pci_dev *pci_dev,
static void virtio_pci_remove(struct pci_dev *pci_dev)
{
struct virtio_pci_device *vp_dev = pci_get_drvdata(pci_dev);
struct device *dev = get_device(&vp_dev->vdev.dev);
unregister_virtio_device(&vp_dev->vdev);
@ -554,6 +555,7 @@ static void virtio_pci_remove(struct pci_dev *pci_dev)
virtio_pci_modern_remove(vp_dev);
pci_disable_device(pci_dev);
put_device(dev);
}
static struct pci_driver virtio_pci_driver = {