Stuart Lee 03e63e497a drm/mediatek: Fix access violation in mtk_drm_crtc_dma_dev_get
commit b6961d187f upstream.

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: cb1d6bcca5 ("drm/mediatek: Add dma dev get function")
Signed-off-by: Stuart Lee <stuart.lee@mediatek.com>
Cc: stable@vger.kernel.org
Reviewed-by: AngeloGioacchino DEl Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Macpaul Lin <macpaul.lin@mediatek.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20231110012914.14884-2-stuart.lee@mediatek.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-12-20 17:02:02 +01:00
2023-10-19 16:40:00 +02:00
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2023-12-13 18:45:36 +01:00
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