linux-kernel - Re: [PATCH 1/1] tty: vt: Remove redundant null check before kfree.

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Message-ID: <20121121144624.GA21766@kroah.com>
Date:	Wed, 21 Nov 2012 06:46:24 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Sachin Kamat <sachin.kamat@...aro.org>
Cc:	linux-kernel@...r.kernel.org, patches@...aro.org
Subject: Re: [PATCH 1/1] tty: vt: Remove redundant null check before kfree.

On Wed, Nov 21, 2012 at 10:49:07AM +0530, Sachin Kamat wrote:
> kfree on a NULL pointer is a no-op.
> 
> Signed-off-by: Sachin Kamat <sachin.kamat@...aro.org>
> ---
>  drivers/tty/vt/consolemap.c |    6 ++----
>  1 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/tty/vt/consolemap.c b/drivers/tty/vt/consolemap.c
> index 2aaa0c2..248381b 100644
> --- a/drivers/tty/vt/consolemap.c
> +++ b/drivers/tty/vt/consolemap.c
> @@ -410,10 +410,8 @@ static void con_release_unimap(struct uni_pagedir *p)
>  		kfree(p->inverse_translations[i]);
>  		p->inverse_translations[i] = NULL;
>  	}
> -	if (p->inverse_trans_unicode) {
> -		kfree(p->inverse_trans_unicode);
> -		p->inverse_trans_unicode = NULL;
> -	}
> +	kfree(p->inverse_trans_unicode);
> +	p->inverse_trans_unicode = NULL;

kfree with NULL is a no-op, but the line after that just caused a kernel
crash if it was NULL, so I can't accept this type of thing.

Please be more careful.

What's with the patches@...aro.org email address?  What is that for?

thanks,

greg k-h
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