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V4L/DVB (13132): fix use-after-free Oops, resulting from a driver-core API change

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Commit b402843787 has broken again re-use of
device objects across device_register() / device_unregister() cycles. Fix
soc-camera by nullifying the struct after device_unregister().

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Guennadi Liakhovetski 2009-10-05 12:54:54 -03:00 committed by Mauro Carvalho Chehab
parent 07bc46e667
commit 76823b791d
1 changed files with 9 additions and 7 deletions
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16
drivers/media/video/soc_camera.c
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@ -1160,13 +1160,15 @@ void soc_camera_host_unregister(struct soc_camera_host *ici)
if (icd->iface == ici->nr) {
/* The bus->remove will be called */
device_unregister(&icd->dev);
/* Not before device_unregister(), .remove
* needs parent to call ici->ops->remove() */
icd->dev.parent = NULL;
/* If the host module is loaded again, device_register()
* would complain "already initialised" */
memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj));
/*
* Not before device_unregister(), .remove
* needs parent to call ici->ops->remove().
* If the host module is loaded again, device_register()
* would complain "already initialised," since 2.6.32
* this is also needed to prevent use-after-free of the
* device private data.
*/
memset(&icd->dev, 0, sizeof(icd->dev));
}
}