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Merge tag 'mediatek-drm-fixes-20250910' of https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux into drm-fixes

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Mediatek DRM Fixes - 20250910

1. fix potential OF node use-after-free

Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Link: https://lore.kernel.org/r/20250910231813.3526-1-chunkuang.hu@kernel.org
This commit is contained in:
Dave Airlie
2025-09-12 09:31:23 +10:00
parent 1d00adb873 9ba2556cef
commit f2c8bbb6e9
1 changed files with 9 additions and 14 deletions
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23
drivers/gpu/drm/mediatek/mtk_drm_drv.c
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@@ -387,19 +387,21 @@ static bool mtk_drm_get_all_drm_priv(struct device *dev)
of_id = of_match_node(mtk_drm_of_ids, node);
if (!of_id)
goto next_put_node;
continue;
pdev = of_find_device_by_node(node);
if (!pdev)
goto next_put_node;
continue;
drm_dev = device_find_child(&pdev->dev, NULL, mtk_drm_match);
put_device(&pdev->dev);
if (!drm_dev)
goto next_put_device_pdev_dev;
continue;
temp_drm_priv = dev_get_drvdata(drm_dev);
put_device(drm_dev);
if (!temp_drm_priv)
goto next_put_device_drm_dev;
continue;
if (temp_drm_priv->data->main_len)
all_drm_priv[CRTC_MAIN] = temp_drm_priv;
@@ -411,17 +413,10 @@ static bool mtk_drm_get_all_drm_priv(struct device *dev)
if (temp_drm_priv->mtk_drm_bound)
cnt++;
next_put_device_drm_dev:
put_device(drm_dev);
next_put_device_pdev_dev:
put_device(&pdev->dev);
next_put_node:
of_node_put(node);
if (cnt == MAX_CRTC)
if (cnt == MAX_CRTC) {
of_node_put(node);
break;
}
}
if (drm_priv->data->mmsys_dev_num == cnt) {