linux-kernel - Re: [PATCH v2 0/3] drm/display: bridge_connector: get/put the stored bridges: fix NULL pointer regression

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Message-ID: <whkqe5j4ydzjh6f7qiiz5q3dpqwry7anadpzl3dfvjftz36tua@zq4vkvriadci>
Date: Mon, 3 Nov 2025 07:20:17 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Luca Ceresoli <luca.ceresoli@...tlin.com>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.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>,
        Hui Pu <Hui.Pu@...ealthcare.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] drm/display: bridge_connector: get/put the stored
 bridges: fix NULL pointer regression

On Fri, Oct 17, 2025 at 06:15:03PM +0200, Luca Ceresoli wrote:
> A patch of mine recently merged in drm-misc-next [1] has a NULL pointer
> deref regression (reported here [2] and here [3]). Being in lack of a quick
> fix, I sent a revert proposal [4].
> 
> The revert proposal has no answers currenty, and in the meanwhile I have a
> patch that implements the original idea but without the same bug. So here's
> a v2 series with:
> 
>  - the same revert patch
>  - the original patch but rewritten without the same bug (and even simpler)
> 
> Also the re-written patch is now split in two for clarity because it was
> doing two somewhat different things.
> 
> [1] https://lore.kernel.org/all/20250926-drm-bridge-alloc-getput-bridge-connector-v2-1-138b4bb70576@bootlin.com/
> [2] https://lore.kernel.org/lkml/336fbfdd-c424-490e-b5d1-8ee84043dc80@samsung.com/
> [3] https://lore.kernel.org/lkml/CA+G9fYuKHp3QgPKjgFY3TfkDdh5Vf=Ae5pCW+eU41Bu=D7th2g@mail.gmail.com/
> [4] https://lore.kernel.org/lkml/20251016-drm-bridge-alloc-getput-bridge-connector-fix-hdmi_cec-v1-1-81d6984c5361@bootlin.com/
> 
> Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
> ---
> Changes in v2:
> - No changes to the revert patch
> - Added the (corrected) patch introducing the same feature as the original
>   buggy patch, and also split it in two fir clarity
> - Link to v1: https://lore.kernel.org/r/20251016-drm-bridge-alloc-getput-bridge-connector-fix-hdmi_cec-v1-1-81d6984c5361@bootlin.com
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>

Tested-by: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com> # db410c



-- 
With best wishes
Dmitry