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

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Date:   Mon, 17 Jul 2023 11:50:03 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Chenyuan Mi <michenyuan@...wei.com>
CC:     <dan.j.williams@...el.com>, <dave.jiang@...el.com>,
        <rrichter@....com>, <alison.schofield@...el.com>,
        <linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>
Subject: Re: [PATCH] cxl: Fix memory leak bug in alloc_mock_res()

On Mon, 17 Jul 2023 04:16:09 +0000
Chenyuan Mi <michenyuan@...wei.com> wrote:

> 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>

+CC linux-cxl list

Please make sure to include that for any future CXL patches.

> ---
>  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,