linux-kernel - Re: [PATCH] fpga: dfl: fme: Return directly after a failed devm_kasprintf() call in fme_perf_pmu

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Message-ID: <ZbjJYMlDifIv0WId@yilunxu-OptiPlex-7050>
Date: Tue, 30 Jan 2024 18:03:12 +0800
From: Xu Yilun <yilun.xu@...ux.intel.com>
To: Markus Elfring <Markus.Elfring@....de>
Cc: linux-fpga@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Luwei Kang <luwei.kang@...el.com>, Moritz Fischer <mdf@...nel.org>,
	Tom Rix <trix@...hat.com>, Wu Hao <hao.wu@...el.com>,
	Xu Yilun <yilun.xu@...el.com>, LKML <linux-kernel@...r.kernel.org>,
	Kunwu Chan <chentao@...inos.cn>
Subject: Re: [PATCH] fpga: dfl: fme: Return directly after a failed
 devm_kasprintf() call in fme_perf_pmu_register()

On Sat, Jan 27, 2024 at 03:55:19PM +0100, Markus Elfring wrote:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sat, 27 Jan 2024 15:43:42 +0100
> 
> The result from a call of the function “devm_kasprintf” was passed to
> a subsequent function call without checking for a null pointer before
> (according to a memory allocation failure).
> This issue was detected by using the Coccinelle software.
> 
> Thus return directly after a failed devm_kasprintf() call.
> 
> Fixes: 724142f8c42a7 ("fpga: dfl: fme: add performance reporting support")
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>

Acked-by: Xu Yilun <yilun.xu@...el.com>

> ---
>  drivers/fpga/dfl-fme-perf.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/fpga/dfl-fme-perf.c b/drivers/fpga/dfl-fme-perf.c
> index 7422d2bc6f37..db56d52411ef 100644
> --- a/drivers/fpga/dfl-fme-perf.c
> +++ b/drivers/fpga/dfl-fme-perf.c
> @@ -925,6 +925,8 @@ static int fme_perf_pmu_register(struct platform_device *pdev,
>  				PERF_PMU_CAP_NO_EXCLUDE;
> 
>  	name = devm_kasprintf(priv->dev, GFP_KERNEL, "dfl_fme%d", pdev->id);
> +	if (!name)
> +		return -ENOMEM;
> 
>  	ret = perf_pmu_register(pmu, name, -1);
>  	if (ret)
> --
> 2.43.0
> 
>