linux/drivers/gpu
Chen-Yu Tsai 36b617f7e4 drm/mediatek: dp: Only trigger DRM HPD events if bridge is attached
The MediaTek DisplayPort interface bridge driver starts its interrupts
as soon as its probed. However when the interrupts trigger the bridge
might not have been attached to a DRM device. As drm_helper_hpd_irq_event()
does not check whether the passed in drm_device is valid or not, a NULL
pointer passed in results in a kernel NULL pointer dereference in it.

Check whether the bridge is attached and only trigger an HPD event if
it is.

Fixes: f70ac097a2 ("drm/mediatek: Add MT8195 Embedded DisplayPort driver")
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Guillaume Ranquet <granquet@baylibre.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20230202045734.2773503-1-wenst@chromium.org/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
2023-03-12 15:29:38 +00:00
..
drm drm/mediatek: dp: Only trigger DRM HPD events if bridge is attached 2023-03-12 15:29:38 +00:00
host1x IOMMU Updates for Linux v6.3: 2023-02-24 13:40:13 -08:00
ipu-v3 gpu: ipu-v3: common: Add of_node_put() for reference returned by of_graph_get_port_by_id() 2022-12-16 18:40:29 +01:00
trace
vga
Makefile