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media: usbtv: Fix refcounting mixup 

commit bf65f8aabd upstream.

The premature free in the error path is blocked by V4L
refcounting, not USB refcounting. Thanks to
Ben Hutchings for review.

[v2] corrected attributions

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Fixes: 50e7044535 ("media: usbtv: prevent double free in error case")
CC: stable@vger.kernel.org
Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Oliver Neukum 2020-09-24 11:14:10 +02:00 committed by Greg Kroah-Hartman
parent 6ad2e647d9
commit b970578274
1 changed files with 2 additions and 1 deletions
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3
drivers/media/usb/usbtv/usbtv-core.c
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@ -113,7 +113,8 @@ static int usbtv_probe(struct usb_interface *intf,
usbtv_audio_fail:
/* we must not free at this point */
usb_get_dev(usbtv->udev);
v4l2_device_get(&usbtv->v4l2_dev);
/* this will undo the v4l2_device_get() */
usbtv_video_free(usbtv);
usbtv_video_fail: