linux-kernel - Re: [PATCH] Staging: irda: Do not check for NOT NULL before kfree()

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Message-ID: <1513625246.3434.0.camel@gmail.com>
Date:   Tue, 19 Dec 2017 00:57:26 +0530
From:   Shreeya Patel <shreeya.patel23498@...il.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     samuel@...tiz.org, gregkh@...uxfoundation.org,
        netdev@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Staging: irda: Do not check for NOT NULL before kfree()

On Mon, 2017-12-18 at 11:20 -0800, Stephen Hemminger wrote:
> On Tue, 19 Dec 2017 00:41:30 +0530
> Shreeya Patel <shreeya.patel23498@...il.com> wrote:
> 
> > 
> > Do not check for NOT NULL before calling kfree because if the
> > pointer is NULL, no action occurs.
> > Done using the following semantic patch by coccinelle.
> > 
> > @@
> > expression ptr;
> > @@
> > 
> > - if (ptr != NULL) {
> >   kfree(ptr);
> >   ptr = NULL;
> > - }
> > 
> > The semantic patch has the effect of adding an assignment
> > of ptr to NULL in the case where ptr is NULL already.
> > 
> > Signed-off-by: Shreeya Patel <shreeya.patel23498@...il.com>
> Please read drivers/staging/irda/TODO

Oh, I was not knowing about it.

Thank you
>