From: Harry Wentland <harry.wentland@amd.com>
Date: Fri, 10 Nov 2017 20:17:03 -0500
Subject: drm/amd/display: Fix potential mem leak in DC construct
Git-commit: 52924dc3d0daf725a63f5c749cb263aad06f928a
Patch-mainline: v4.16-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Found by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:506 construct() warn:
possible memory leak of 'dc_ctx'
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:506 construct() warn:
possible memory leak of 'dc_vbios'
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:506 construct() warn:
possible memory leak of 'dcn_ip'
drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc.c:506 construct() warn:
possible memory leak of 'dcn_soc'

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/dc/core/dc.c |   34 ++++++++++++++++---------------
 1 file changed, 18 insertions(+), 16 deletions(-)

--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -283,19 +283,17 @@ static bool construct(struct dc *dc,
 		const struct dc_init_data *init_params)
 {
 	struct dal_logger *logger;
-	struct dc_context *dc_ctx = kzalloc(sizeof(*dc_ctx), GFP_KERNEL);
-	struct bw_calcs_dceip *dc_dceip = kzalloc(sizeof(*dc_dceip),
-						  GFP_KERNEL);
-	struct bw_calcs_vbios *dc_vbios = kzalloc(sizeof(*dc_vbios),
-						  GFP_KERNEL);
+	struct dc_context *dc_ctx;
+	struct bw_calcs_dceip *dc_dceip;
+	struct bw_calcs_vbios *dc_vbios;
 #ifdef CONFIG_DRM_AMD_DC_DCN1_0
-	struct dcn_soc_bounding_box *dcn_soc = kzalloc(sizeof(*dcn_soc),
-						       GFP_KERNEL);
-	struct dcn_ip_params *dcn_ip = kzalloc(sizeof(*dcn_ip), GFP_KERNEL);
+	struct dcn_soc_bounding_box *dcn_soc;
+	struct dcn_ip_params *dcn_ip;
 #endif
 
 	enum dce_version dc_version = DCE_VERSION_UNKNOWN;
 
+	dc_dceip = kzalloc(sizeof(*dc_dceip), GFP_KERNEL);
 	if (!dc_dceip) {
 		dm_error("%s: failed to create dceip\n", __func__);
 		goto fail;
@@ -303,6 +301,7 @@ static bool construct(struct dc *dc,
 
 	dc->bw_dceip = dc_dceip;
 
+	dc_vbios = kzalloc(sizeof(*dc_vbios), GFP_KERNEL);
 	if (!dc_vbios) {
 		dm_error("%s: failed to create vbios\n", __func__);
 		goto fail;
@@ -310,6 +309,7 @@ static bool construct(struct dc *dc,
 
 	dc->bw_vbios = dc_vbios;
 #ifdef CONFIG_DRM_AMD_DC_DCN1_0
+	dcn_soc = kzalloc(sizeof(*dcn_soc), GFP_KERNEL);
 	if (!dcn_soc) {
 		dm_error("%s: failed to create dcn_soc\n", __func__);
 		goto fail;
@@ -317,6 +317,7 @@ static bool construct(struct dc *dc,
 
 	dc->dcn_soc = dcn_soc;
 
+	dcn_ip = kzalloc(sizeof(*dcn_ip), GFP_KERNEL);
 	if (!dcn_ip) {
 		dm_error("%s: failed to create dcn_ip\n", __func__);
 		goto fail;
@@ -325,11 +326,18 @@ static bool construct(struct dc *dc,
 	dc->dcn_ip = dcn_ip;
 #endif
 
+	dc_ctx = kzalloc(sizeof(*dc_ctx), GFP_KERNEL);
 	if (!dc_ctx) {
 		dm_error("%s: failed to create ctx\n", __func__);
 		goto fail;
 	}
 
+	dc_ctx->cgs_device = init_params->cgs_device;
+	dc_ctx->driver_context = init_params->driver;
+	dc_ctx->dc = dc;
+	dc_ctx->asic_id = init_params->asic_id;
+	dc->ctx = dc_ctx;
+
 	dc->current_state = dc_create_state();
 
 	if (!dc->current_state) {
@@ -337,11 +345,6 @@ static bool construct(struct dc *dc,
 		goto fail;
 	}
 
-	dc_ctx->cgs_device = init_params->cgs_device;
-	dc_ctx->driver_context = init_params->driver;
-	dc_ctx->dc = dc;
-	dc_ctx->asic_id = init_params->asic_id;
-
 	/* Create logger */
 	logger = dal_logger_create(dc_ctx, init_params->log_mask);
 
@@ -351,11 +354,10 @@ static bool construct(struct dc *dc,
 		goto fail;
 	}
 	dc_ctx->logger = logger;
-	dc->ctx = dc_ctx;
-	dc->ctx->dce_environment = init_params->dce_environment;
+	dc_ctx->dce_environment = init_params->dce_environment;
 
 	dc_version = resource_parse_asic_id(init_params->asic_id);
-	dc->ctx->dce_version = dc_version;
+	dc_ctx->dce_version = dc_version;
 
 #if defined(CONFIG_DRM_AMD_DC_FBC)
 	dc->ctx->fbc_gpu_addr = init_params->fbc_gpu_addr;