linux-kernel - RE: regmap: debugfs: fix a memory leak when calling regmap_attach

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Date:   Mon, 28 Dec 2020 02:26:33 +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>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Brown <broonie@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: RE: regmap: debugfs: fix a memory leak when calling regmap_attach_dev

> Do you mean so?
>
> commit:
>          9b947a13e7f6 ("regmap: use debugfs even when no device")

> Please take another look at known information sources.

> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=f838f8d2b694cf9d524dc4423e9dd2db13892f3f#n89
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=f838f8d2b694cf9d524dc4423e9dd2db13892f3f#n121



> Which one do you mean by "another null point"?

How do you think about to check if calls of the function “kasprintf” succeeded here?
https://elixir.bootlin.com/linux/v5.10.3/source/lib/kasprintf.c#L53

Will any more exception handling become relevant also for the implementation of the function “regmap_debugfs_init”?


-----Original Message-----
From: Markus Elfring <Markus.Elfring@....de> 
Sent: Sunday, December 27, 2020 9:40 PM
To: Wang, Xiaolei <Xiaolei.Wang@...driver.com>; kernel-janitors@...r.kernel.org
Cc: linux-kernel@...r.kernel.org; Greg Kroah-Hartman <gregkh@...uxfoundation.org>; Mark Brown <broonie@...nel.org>; Rafael J. Wysocki <rafael@...nel.org>
Subject: Re: regmap: debugfs: fix a memory leak when calling regmap_attach_dev

> Do you mean so?
>
> commit:
>          9b947a13e7f6 ("regmap: use debugfs even when no device")

> Please take another look at known information sources.

> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=f838f8d2b694cf9d524dc4423e9dd2db13892f3f#n89
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=f838f8d2b694cf9d524dc4423e9dd2db13892f3f#n121

> Which one do you mean by "another null point"?

> How do you think about to check if calls of the function “kasprintf” succeeded here?
> https://elixir.bootlin.com/linux/v5.10.3/source/lib/kasprintf.c#L53

> Will any more exception handling become relevant also for the implementation of the function “regmap_debugfs_init”?

Thanks for your suggestion, I will modify the commit log and add another null point check together with corresponding exception handling


Regards,
Xiaolei