From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Dan Carpenter <dan.carpenter@oracle.com>,
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 08:25:45 +0000 [thread overview]
Message-ID: <5545024.x6hpeqSvG5@avalon> (raw)
In-Reply-To: <543F8069.8020005@xs4all.nl>
On Thursday 16 October 2014 10:23:05 Hans Verkuil wrote:
> On 10/16/2014 10:09 AM, Laurent Pinchart wrote:
> > 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 ?
>
> I have hardware, and at some point I plan to convert it to modern
> frameworks. But ENOTIME for now. So I guess I might be the closest to a
> being a maintainer.
Can you ack the patch then ? :-)
> >> 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
WARNING: multiple messages have this Message-ID (diff)
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Hans Verkuil <hverkuil@xs4all.nl>
Cc: Dan Carpenter <dan.carpenter@oracle.com>,
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 11:25:45 +0300 [thread overview]
Message-ID: <5545024.x6hpeqSvG5@avalon> (raw)
In-Reply-To: <543F8069.8020005@xs4all.nl>
On Thursday 16 October 2014 10:23:05 Hans Verkuil wrote:
> On 10/16/2014 10:09 AM, Laurent Pinchart wrote:
> > 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 ?
>
> I have hardware, and at some point I plan to convert it to modern
> frameworks. But ENOTIME for now. So I guess I might be the closest to a
> being a maintainer.
Can you ack the patch then ? :-)
> >> 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 8:25 UTC|newest]
Thread overview: 8+ 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 7:57 ` Dan Carpenter
2014-10-16 8:09 ` Laurent Pinchart
2014-10-16 8:09 ` Laurent Pinchart
2014-10-16 8:23 ` Hans Verkuil
2014-10-16 8:23 ` Hans Verkuil
2014-10-16 8:25 ` Laurent Pinchart [this message]
2014-10-16 8:25 ` Laurent Pinchart
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