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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2019-07-29 23:14:55 -0300
committerMauro Carvalho Chehab <mchehab+samsung@kernel.org>2019-10-16 16:33:58 -0300
commit8c279e9394cade640ed86ec6c6645a0e7df5e0b6 (patch)
treef2aa9f45b2bcf513a8e5ca7ecd27a1fd9ff84afa
parentd9aeaa6d4ca44df5fae745fd47aede8b3f6137f1 (diff)
media: uvcvideo: Fix error path in control parsing failure
When parsing the UVC control descriptors fails, the error path tries to cleanup a media device that hasn't been initialised, potentially resulting in a crash. Fix this by initialising the media device before the error handling path can be reached. Fixes: 5a254d751e52 ("[media] uvcvideo: Register a v4l2_device") Reported-by: syzbot+c86454eb3af9e8a4da20@syzkaller.appspotmail.com Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
-rw-r--r--drivers/media/usb/uvc/uvc_driver.c28
1 files changed, 15 insertions, 13 deletions
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index 66ee168ddc7e..428235ca2635 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -2151,6 +2151,20 @@ static int uvc_probe(struct usb_interface *intf,
sizeof(dev->name) - len);
}
+ /* Initialize the media device. */
+#ifdef CONFIG_MEDIA_CONTROLLER
+ dev->mdev.dev = &intf->dev;
+ strscpy(dev->mdev.model, dev->name, sizeof(dev->mdev.model));
+ if (udev->serial)
+ strscpy(dev->mdev.serial, udev->serial,
+ sizeof(dev->mdev.serial));
+ usb_make_path(udev, dev->mdev.bus_info, sizeof(dev->mdev.bus_info));
+ dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
+ media_device_init(&dev->mdev);
+
+ dev->vdev.mdev = &dev->mdev;
+#endif
+
/* Parse the Video Class control descriptor. */
if (uvc_parse_control(dev) < 0) {
uvc_trace(UVC_TRACE_PROBE, "Unable to parse UVC "
@@ -2171,19 +2185,7 @@ static int uvc_probe(struct usb_interface *intf,
"linux-uvc-devel mailing list.\n");
}
- /* Initialize the media device and register the V4L2 device. */
-#ifdef CONFIG_MEDIA_CONTROLLER
- dev->mdev.dev = &intf->dev;
- strscpy(dev->mdev.model, dev->name, sizeof(dev->mdev.model));
- if (udev->serial)
- strscpy(dev->mdev.serial, udev->serial,
- sizeof(dev->mdev.serial));
- usb_make_path(udev, dev->mdev.bus_info, sizeof(dev->mdev.bus_info));
- dev->mdev.hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
- media_device_init(&dev->mdev);
-
- dev->vdev.mdev = &dev->mdev;
-#endif
+ /* Register the V4L2 device. */
if (v4l2_device_register(&intf->dev, &dev->vdev) < 0)
goto error;

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