drm/i915/display: Fix color pipeline enum name leak

intel_color_pipeline_plane_init() allocates enum names for color
pipelines, which are copied by drm_property_create_enum(). The temporary
strings were not freed, resulting in a memory leak.

Allocate enum names only after successful pipeline construction and free
them on all exit paths.

Fixes: ef105316819d ("drm/i915/color: Create a transfer function color pipeline")
Signed-off-by: Chaitanya Kumar Borah <[e-mail]>
Reviewed-by: Suraj Kandpal <[e-mail]>
Reviewed-by: Uma Shankar <[e-mail]>
Signed-off-by: Maarten Lankhorst <[e-mail]>
Acked-by: Jani Nikula <[e-mail]>
Link: https://patch.msgid.link/[e-mail]

drivers/gpu/drm/i915/display/intel_color_pipeline.c

···
 		return ret;
 
 	list->type = colorop->base.base.id;
-	list->name = kasprintf(GFP_KERNEL, "Color Pipeline %d", colorop->base.base.id);
 
 	/* TODO: handle failures and clean up */
 	prev_op = &colorop->base;
···
 
 	drm_colorop_set_next_property(prev_op, &colorop->base);
 
+	list->name = kasprintf(GFP_KERNEL, "Color Pipeline %d", list->type);
+
 	return 0;
 }
 
···
 {
 	struct drm_device *dev = plane->dev;
 	struct intel_display *display = to_intel_display(dev);
-	struct drm_prop_enum_list pipelines[MAX_COLOR_PIPELINES];
+	struct drm_prop_enum_list pipelines[MAX_COLOR_PIPELINES] = {};
 	int len = 0;
-	int ret;
+	int ret = 0;
+	int i;
 
 	/* Currently expose pipeline only for HDR planes */
 	if (!icl_is_hdr_plane(display, to_intel_plane(plane)->id))
···
 	/* Add pipeline consisting of transfer functions */
 	ret = _intel_color_pipeline_plane_init(plane, &pipelines[len], pipe);
 	if (ret)
-		return ret;
+		goto out;
 	len++;
 
-	return drm_plane_create_color_pipeline_property(plane, pipelines, len);
+	ret = drm_plane_create_color_pipeline_property(plane, pipelines, len);
+
+	for (i = 0; i < len; i++)
+		kfree(pipelines[i].name);
+
+out:
+	return ret;
 }