linux-kernel - Re: [PATCH 1/1] drm/mediatek: Fix access violation in mtk_drm_crtc_dma_dev

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Date:   Fri, 10 Nov 2023 12:57:17 +0100
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Stuart Lee <stuart.lee@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "Nancy . Lin" <nancy.lin@...iatek.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Lancelot Wu <lancelot.wu@...iatek.com>,
        Shawn Sung <shawn.sung@...iatek.com>,
        Pablo Sun <pablo.sun@...iatek.com>,
        Macpaul Lin <macpaul.lin@...iatek.com>, stable@...r.kernel.org
Subject: Re: [PATCH 1/1] drm/mediatek: Fix access violation in
 mtk_drm_crtc_dma_dev_get

Il 10/11/23 02:29, Stuart Lee ha scritto:
> Add error handling to check NULL input in
> mtk_drm_crtc_dma_dev_get function.
> 
> While display path is not configured correctly, none of crtc is
> established. So the caller of mtk_drm_crtc_dma_dev_get may pass
> input parameter *crtc as NULL, Which may cause coredump when
> we try to get the container of NULL pointer.
> 
> Fixes: cb1d6bcca542 ("drm/mediatek: Add dma dev get function")
> Signed-off-by: Stuart Lee <stuart.lee@...iatek.com>
> Cc: stable@...r.kernel.org

Reviewed-by: AngeloGioacchino DEl Regno <angelogioacchino.delregno@...labora.com>