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

From: neil . armstrong
Date: Mon Oct 09 2023 - 04:56:26 EST


On 07/10/2023 05:03, Ma Ke wrote:
In radeon_fp_native_mode(), the return value of drm_mode_duplicate()

Wrong function, it should be tpg110_get_modes()

Thanks,
Neil

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;