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| author | Michael S. Tsirkin <mst@redhat.com> | 2016-01-14 16:00:41 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2016-01-26 10:18:28 +0200 |
| commit | 2989be09a8a9d62a785137586ad941f916e08f83 (patch) | |
| tree | 91fc1b8002e4c9868d0e692dd6b4039e965c9a36 /drivers/virtio/virtio_pci_common.c | |
| parent | 92e963f50fc74041b5e9e744c330dca48e04f08d (diff) | |
| download | lwn-2989be09a8a9d62a785137586ad941f916e08f83.tar.gz lwn-2989be09a8a9d62a785137586ad941f916e08f83.zip | |
virtio_pci: fix use after free on release
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: 63bd62a08ca4 ("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>
Diffstat (limited to 'drivers/virtio/virtio_pci_common.c')
| -rw-r--r-- | drivers/virtio/virtio_pci_common.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_pci_common.c b/drivers/virtio/virtio_pci_common.c index 36205c27c4d0..f6bed86c17f9 100644 --- a/drivers/virtio/virtio_pci_common.c +++ b/drivers/virtio/virtio_pci_common.c @@ -545,6 +545,7 @@ err_enable_device: 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 = { |