Re: [PATCH v2] drm/panel/panel-tpo-tpg110: fix a possible null pointer dereference

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On 09/10/2023 11:04, Ma Ke wrote:
In tpg110_get_modes(), the return value of drm_mode_duplicate() is
assigned to mode, which will lead to a NULL pointer dereference on
failure of drm_mode_duplicate(). Add a check to avoid npd.

Signed-off-by: Ma Ke <make_ruc2021@xxxxxxx>
---
  drivers/gpu/drm/panel/panel-tpo-tpg110.c | 2 ++
  1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-tpo-tpg110.c b/drivers/gpu/drm/panel/panel-tpo-tpg110.c
index 845304435e23..f6a212e542cb 100644
--- a/drivers/gpu/drm/panel/panel-tpo-tpg110.c
+++ b/drivers/gpu/drm/panel/panel-tpo-tpg110.c
@@ -379,6 +379,8 @@ static int tpg110_get_modes(struct drm_panel *panel,
  	connector->display_info.bus_flags = tpg->panel_mode->bus_flags;
mode = drm_mode_duplicate(connector->dev, &tpg->panel_mode->mode);
+	if (!mode)
+		return -ENOMEM;
  	drm_mode_set_name(mode);
  	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;

Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>



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