linux-kernel - Re: [PATCH v4 0/2] media: pci: Fix invalid access to file *

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Message-ID: <0627cfba-798a-482b-b335-cc78a609c150@kernel.org>
Date: Tue, 14 Oct 2025 09:05:20 +0200
From: Hans Verkuil <hverkuil+cisco@...nel.org>
To: Jacopo Mondi <jacopo.mondi@...asonboard.com>,
 Andy Walls <awalls@...metrocast.net>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Cc: Dan Carpenter <dan.carpenter@...aro.org>, stable@...r.kernel.org,
 linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/2] media: pci: Fix invalid access to file *

Hi Jacopo,

On 19/08/2025 09:07, Jacopo Mondi wrote:
> Since commits
> 7b9eb53e8591 ("media: cx18: Access v4l2_fh from file")
> 9ba9d11544f9 ("media: ivtv: Access v4l2_fh from file")
> 
> All the ioctl handlers access their private data structures
> from file *
> 
> The ivtv and cx18 drivers call the ioctl handlers from their
> DVB layer without a valid file *, causing invalid memory access.
> 
> The issue has been reported by smatch in
> "[bug report] media: cx18: Access v4l2_fh from file"
> 
> Fix this by providing wrappers for the ioctl handlers to be
> used by the DVB layer that do not require a valid file *.

This series should go to the fixes branch for v6.18, right?
This looks like a pure regression, so I think that makes sense.

BTW, why is there a Link: tag in the cx18 patch? It just links to
the v1 of the patch and that doesn't add meaningful information.
Linus likes Link:, but only if it really adds useful information.

Regards,

	Hans

> 
> Signed-off-by: Jacopo Mondi <jacopo.mondi@...asonboard.com>
> ---
> Changes in v4:
> - Slightly adjust commit messages
> - Link to v3: https://lore.kernel.org/r/20250818-cx18-v4l2-fh-v3-0-5e2f08f3cadc@ideasonboard.com
> 
> Changes in v3:
> - Change helpers to accept the type they're going to operate on instead
>   of using the open_id wrapper type as suggested by Laurent
> - Link to v2: https://lore.kernel.org/r/20250818-cx18-v4l2-fh-v2-0-3f53ce423663@ideasonboard.com
> 
> Changes in v2:
> - Add Cc: stable@...r.kernel.org per-patch
> 
> ---
> Jacopo Mondi (2):
>       media: cx18: Fix invalid access to file *
>       media: ivtv: Fix invalid access to file *
> 
>  drivers/media/pci/cx18/cx18-driver.c |  9 +++------
>  drivers/media/pci/cx18/cx18-ioctl.c  | 30 +++++++++++++++++++-----------
>  drivers/media/pci/cx18/cx18-ioctl.h  |  8 +++++---
>  drivers/media/pci/ivtv/ivtv-driver.c | 11 ++++-------
>  drivers/media/pci/ivtv/ivtv-ioctl.c  | 22 +++++++++++++++++-----
>  drivers/media/pci/ivtv/ivtv-ioctl.h  |  6 ++++--
>  6 files changed, 52 insertions(+), 34 deletions(-)
> ---
> base-commit: a75b8d198c55e9eb5feb6f6e155496305caba2dc
> change-id: 20250818-cx18-v4l2-fh-7eaa6199fdde
> 
> Best regards,