linux-kernel - [PATCH v2 2/4] fpga: add a platform driver to the FPGA Manager test suite

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Date:   Fri, 29 Sep 2023 17:20:55 +0200
From:   Marco Pagani <marpagan@...hat.com>
To:     Moritz Fischer <mdf@...nel.org>, Wu Hao <hao.wu@...el.com>,
        Xu Yilun <yilun.xu@...el.com>, Tom Rix <trix@...hat.com>
Cc:     Marco Pagani <marpagan@...hat.com>, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org, Jinjie Ruan <ruanjinjie@...wei.com>
Subject: [PATCH v2 2/4] fpga: add a platform driver to the FPGA Manager test suite

Register a minimal platform driver associated with the parent platform
device used for testing to prevent a null-ptr-deref when try_module_get()
is called by fpga_mgr_get().

Fixes: ccbc1c302115 ("fpga: add an initial KUnit suite for the FPGA Manager")
Reported-by: Jinjie Ruan <ruanjinjie@...wei.com>
Signed-off-by: Marco Pagani <marpagan@...hat.com>
---
 drivers/fpga/tests/fpga-mgr-test.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/fpga/tests/fpga-mgr-test.c b/drivers/fpga/tests/fpga-mgr-test.c
index 6acec55b60ce..30de474d7def 100644
--- a/drivers/fpga/tests/fpga-mgr-test.c
+++ b/drivers/fpga/tests/fpga-mgr-test.c
@@ -14,6 +14,8 @@
 #include <linux/scatterlist.h>
 #include <linux/types.h>
 
+#include "fpga-test-helpers.h"
+
 #define HEADER_FILL		'H'
 #define IMAGE_FILL		'P'
 #define IMAGE_BLOCK		1024
@@ -277,6 +279,18 @@ static void fpga_mgr_test_img_load_sgt(struct kunit *test)
 	sg_free_table(ctx->img_info->sgt);
 }
 
+TEST_PLATFORM_DRIVER(test_platform_driver);
+
+static int fpga_mgr_test_suite_init(struct kunit_suite *suite)
+{
+	return platform_driver_register(&test_platform_driver);
+}
+
+static void fpga_mgr_test_suite_exit(struct kunit_suite *suite)
+{
+	platform_driver_unregister(&test_platform_driver);
+}
+
 static int fpga_mgr_test_init(struct kunit *test)
 {
 	struct mgr_ctx *ctx;
@@ -284,7 +298,7 @@ static int fpga_mgr_test_init(struct kunit *test)
 	ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
 
-	ctx->pdev = platform_device_register_simple("mgr_pdev", PLATFORM_DEVID_AUTO, NULL, 0);
+	ctx->pdev = platform_device_register_simple(TEST_PDEV_NAME, PLATFORM_DEVID_AUTO, NULL, 0);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->pdev);
 
 	ctx->mgr = devm_fpga_mgr_register(&ctx->pdev->dev, "Fake FPGA Manager", &fake_mgr_ops,
@@ -317,6 +331,8 @@ static struct kunit_case fpga_mgr_test_cases[] = {
 
 static struct kunit_suite fpga_mgr_suite = {
 	.name = "fpga_mgr",
+	.suite_init = fpga_mgr_test_suite_init,
+	.suite_exit = fpga_mgr_test_suite_exit,
 	.init = fpga_mgr_test_init,
 	.exit = fpga_mgr_test_exit,
 	.test_cases = fpga_mgr_test_cases,
-- 
2.41.0