drm/amd/display: Check for invalid input params when building scaling params

[ Upstream commit 73b1da6 ]

[WHY]
Function to calculate scaling ratios can be called with invalid plane
src/dest, causing a divide by zero.

[HOW]
Fail building scaling params if plane state src/dest rects are
unpopulated

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Charlene Liu <Charlene.Liu@amd.com>
Acked-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Michael Strauss <michael.strauss@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Stable-dep-of: 374c9fa ("drm/amd/display: Fix null check for pipe_ctx->plane_state in resource_build_scaling_params")
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: Michael Strauss

drivers/gpu/drm/amd/display/dc/core/dc_resource.c

@@ -951,6 +951,15 @@ bool resource_build_scaling_params(struct pipe_ctx *pipe_ctx)
 	bool res = false;
 	DC_LOGGER_INIT(pipe_ctx->stream->ctx->logger);
 
+	/* Invalid input */
+	if (!plane_state->dst_rect.width ||
+			!plane_state->dst_rect.height ||
+			!plane_state->src_rect.width ||
+			!plane_state->src_rect.height) {
+		ASSERT(0);
+		return false;
+	}
+
 	pipe_ctx->plane_res.scl_data.format = convert_pixel_format_to_dalsurface(
 			pipe_ctx->plane_state->format);