virtio_pci: fix use after free on release

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[ Upstream commit 2989be09a8 ]

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>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

...

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Michael S. Tsirkin 2016-01-14 16:00:41 +02:00 • committed by Sasha Levin

parent 465cc6de21

commit 593bd1058b

1 changed files with 2 additions and 0 deletions

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drivers/virtio/virtio_pci_common.c

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