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drm/panel: fix a possible null pointer dereference

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In versatile_panel_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@163.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20231007033105.3997998-1-make_ruc2021@163.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231007033105.3997998-1-make_ruc2021@163.com
This commit is contained in:
Ma Ke 2023-10-07 11:31:05 +08:00 committed by Neil Armstrong
parent 253a1d33e5
commit 924e5814d1
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/panel/panel-arm-versatile.c
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@ -267,6 +267,8 @@ static int versatile_panel_get_modes(struct drm_panel *panel,
connector->display_info.bus_flags = vpanel->panel_type->bus_flags; connector->display_info.bus_flags = vpanel->panel_type->bus_flags;
mode = drm_mode_duplicate(connector->dev, &vpanel->panel_type->mode); mode = drm_mode_duplicate(connector->dev, &vpanel->panel_type->mode);
if (!mode)
return -ENOMEM;
drm_mode_set_name(mode); drm_mode_set_name(mode);
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;