From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Hans Verkuil <hverkuil@xs4all.nl>,
Mauro Carvalho Chehab <m.chehab@samsung.com>,
"Lad, Prabhakar" <prabhakar.csengg@gmail.com>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
linux-media@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [patch] [media] usbvision-video: two use after frees
Date: Thu, 16 Oct 2014 08:09:08 +0000 [thread overview]
Message-ID: <1494643.LQNyJpdPt6@avalon> (raw)
In-Reply-To: <20141016075721.GC29096@mwanda>
On Thursday 16 October 2014 10:57:21 Dan Carpenter wrote:
> The lock has been freed in usbvision_release() so there is no need to
> call mutex_unlock() here.
Yuck :-/
The driver should really be converted to use video_device::release. That might
be out of scope for this fix though. Is usbvision maintained ?
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> diff --git a/drivers/media/usb/usbvision/usbvision-video.c
> b/drivers/media/usb/usbvision/usbvision-video.c index 68bc961..9bfa041
> 100644
> --- a/drivers/media/usb/usbvision/usbvision-video.c
> +++ b/drivers/media/usb/usbvision/usbvision-video.c
> @@ -446,6 +446,7 @@ static int usbvision_v4l2_close(struct file *file)
> if (usbvision->remove_pending) {
> printk(KERN_INFO "%s: Final disconnect\n", __func__);
> usbvision_release(usbvision);
> + return 0;
> }
> mutex_unlock(&usbvision->v4l2_lock);
>
> @@ -1221,6 +1222,7 @@ static int usbvision_radio_close(struct file *file)
> if (usbvision->remove_pending) {
> printk(KERN_INFO "%s: Final disconnect\n", __func__);
> usbvision_release(usbvision);
> + return err_code;
> }
>
> mutex_unlock(&usbvision->v4l2_lock);
--
Regards,
Laurent Pinchart
next prev parent reply other threads:[~2014-10-16 8:09 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-16 7:57 [patch] [media] usbvision-video: two use after frees Dan Carpenter
2014-10-16 8:09 ` Laurent Pinchart [this message]
2014-10-16 8:23 ` Hans Verkuil
2014-10-16 8:25 ` Laurent Pinchart
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