linux-kernel - [PATCH] cxl: Fix memory leak bug in alloc_mock

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Message-ID: <20230717041609.1162445-1-michenyuan@huawei.com>
Date:   Mon, 17 Jul 2023 04:16:09 +0000
From:   Chenyuan Mi <michenyuan@...wei.com>
To:     <dan.j.williams@...el.com>
CC:     <Jonathan.Cameron@...wei.com>, <dave.jiang@...el.com>,
        <rrichter@....com>, <alison.schofield@...el.com>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] cxl: Fix memory leak bug in alloc_mock_res()

When gen_pool_alloc_algo() fails, the error handling path
forgets to free 'res'. It would cause a memory leak bug.

Fix it by add kfree() in error handling path.

Signed-off-by: Chenyuan Mi <michenyuan@...wei.com>
---
 tools/testing/cxl/test/cxl.c |   4 +++-
 1 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/testing/cxl/test/cxl.c b/tools/testing/cxl/test/cxl.c
index 0e78d8e19895..250ffd147067 100644
--- a/tools/testing/cxl/test/cxl.c
+++ b/tools/testing/cxl/test/cxl.c
@@ -405,8 +405,10 @@ static struct cxl_mock_res *alloc_mock_res(resource_size_t size, int align)
 	INIT_LIST_HEAD(&res->list);
 	phys = gen_pool_alloc_algo(cxl_mock_pool, size,
 				   gen_pool_first_fit_align, &data);
-	if (!phys)
+	if (!phys) {
+		kfree(res);
 		return NULL;
+	}
 
 	res->range = (struct range) {
 		.start = phys,
-- 
2.25.1