linux-kernel - Re: [PATCH] auxdisplay: hd44780: Fix potential memory leak in hd44780

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Message-ID: <Y3/Dt3f4edPqPFqb@smile.fi.intel.com>
Date:   Thu, 24 Nov 2022 21:19:19 +0200
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     Jianglei Nie <niejianglei2021@....com>
Cc:     ojeda@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] auxdisplay: hd44780: Fix potential memory leak in
 hd44780_remove()

On Wed, Sep 07, 2022 at 03:07:35PM +0800, Jianglei Nie wrote:
> hd44780_probe() allocates a memory chunk for hd with kzalloc() and
> makes "lcd->drvdata->hd44780" point to it. When we call hd44780_remove(),
> we should release all relevant memory and resource. But "lcd->drvdata
> ->hd44780" is not released, which will lead to a memory leak.
> 
> We should release the "lcd->drvdata->hd44780" in hd44780_remove() to fix
> the memory leak bug.

It's pity you haven't compiled your stuff, while the analysis seems valid
to me.

What you need to do is:
1) compile on your side _before_ sending and be sure it compiles;
2) in this particular case you need an additional level of typing;
3) add Fixes tag;
4) resubmit as v2 the new version.

-- 
With Best Regards,
Andy Shevchenko