linux-kernel - RE: [PATCH v3] regmap: debugfs: Fix a memory leak when calling regmap_attach

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Date:   Wed, 30 Dec 2020 10:14:22 +0000
From:   "Wang, Xiaolei" <Xiaolei.Wang@...driver.com>
To:     Markus Elfring <Markus.Elfring@....de>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        David Lechner <david@...hnology.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Brown <broonie@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Julia Lawall <julia.lawall@...6.fr>
Subject: RE: [PATCH v3] regmap: debugfs: Fix a memory leak when calling
 regmap_attach_dev

Hi Markus

Thank you very much, very good suggestion, do I need to re-send a patch to fix this problem, or modify the previous patch and send it again?

Thanks 
Xiaolei

…
> +++ b/drivers/base/regmap/regmap-debugfs.c
> @@ -582,18 +582,25 @@ void regmap_debugfs_init(struct regmap *map)
…
> +			map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
>  					      devname, name);

> I suggest to reconsider the alignment for function call parameters for this patch.


…
> +		if (!map->debugfs_name)
> +			kfree(map->debugfs_name);

> Such a null pointer check is redundant.

> See also:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/scripts/coccinelle/free/ifnullfree.cocci?id=139711f033f636cc78b6aaf7363252241b9698ef#n2




-----Original Message-----
From: Markus Elfring <Markus.Elfring@....de> 
Sent: Wednesday, December 30, 2020 5:49 PM
To: Wang, Xiaolei <Xiaolei.Wang@...driver.com>; kernel-janitors@...r.kernel.org
Cc: linux-kernel@...r.kernel.org; David Lechner <david@...hnology.com>; Greg Kroah-Hartman <gregkh@...uxfoundation.org>; Mark Brown <broonie@...nel.org>; Rafael J. Wysocki <rafael@...nel.org>; Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH v3] regmap: debugfs: Fix a memory leak when calling regmap_attach_dev

…
> +++ b/drivers/base/regmap/regmap-debugfs.c
> @@ -582,18 +582,25 @@ void regmap_debugfs_init(struct regmap *map)
…
> +			map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
>  					      devname, name);

I suggest to reconsider the alignment for function call parameters for this patch.


…
> +		if (!map->debugfs_name)
> +			kfree(map->debugfs_name);

Such a null pointer check is redundant.

See also:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/scripts/coccinelle/free/ifnullfree.cocci?id=139711f033f636cc78b6aaf7363252241b9698ef#n2

Regards,
Markus