linux-kernel - Re: [PATCH 0/6] Rockchip DRM use-after-free & null-ptr-deref fixes

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Message-ID: <8e770288-f29b-4e72-b5a6-e3cfd77b87fb@rock-chips.com>
Date: Thu, 22 Jan 2026 10:27:13 +0800
From: Chaoyi Chen <chaoyi.chen@...k-chips.com>
To: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Cc: Sandy Huang <hjc@...k-chips.com>, Heiko Stübner
 <heiko@...ech.de>, Andy Yan <andy.yan@...k-chips.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
 Dmitry Baryshkov <lumag@...nel.org>, kernel@...labora.com,
 dri-devel@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] Rockchip DRM use-after-free & null-ptr-deref fixes

Hi Cristian,

On 1/22/2026 7:17 AM, Cristian Ciocaltea wrote:
> The first three patches in the series are fixes for use-after-free &
> null-ptr-deref related issues found in dw_dp and inno-hdmi Rockchip DRM
> drivers.
> 

Have you tried calling unbind() and bind() multiple times? 
In this case, can DRM still work properly?

> The remaining ones provide a few minor improvements to dw_dp and
> dw_hdmi_qp.
> 
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
> ---
> Cristian Ciocaltea (6):
>       drm/rockchip: inno-hdmi: Switch to drmm_kzalloc()
>       drm/rockchip: dw_dp: Switch to drmm_kzalloc()
>       drm/rockchip: dw_dp: Fix null-ptr-deref in dw_dp_remove()
>       drm/rockchip: dw_dp: Simplify error handling
>       drm/rockchip: dw_dp: Drop unnecessary #include
>       drm/rockchip: dw_hdmi_qp: Switch to drmm_encoder_init()
> 
>  drivers/gpu/drm/rockchip/dw_dp-rockchip.c      | 35 ++++++++++----------------
>  drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c | 13 +++++-----
>  drivers/gpu/drm/rockchip/inno_hdmi-rockchip.c  |  3 ++-
>  3 files changed, 21 insertions(+), 30 deletions(-)
> ---
> base-commit: 68b271a3a94cfd6c7695a96b6398b52feb89e2c2
> change-id: 20260122-drm-rk-fixes-a7622c71553e
> 
> 
> 
> 
-- 
Best, 
Chaoyi