linux-kernel - Re: [PATCH] staging: media: lirc: lirc_zilog: Fix for possible null pointer dereference

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Date:	Thu, 29 Jan 2015 17:12:40 -0500
From:	Valdis.Kletnieks@...edu
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	Jarod Wilson <jarod@...sonet.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Aya Mahfouz <mahfouz.saif.elyazal@...il.com>,
	Gulsah Kose <gulsah.1004@...il.com>,
	Tuomas Tynkkynen <tuomas.tynkkynen@....fi>,
	Martin Kaiser <martin@...ser.cx>, linux-media@...r.kernel.org,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: media: lirc: lirc_zilog: Fix for possible null pointer dereference

On Thu, 29 Jan 2015 19:48:08 +0100, Rickard Strandqvist said:
> Fix a possible null pointer dereference, there is
> otherwise a risk of a possible null pointer dereference.
>
> This was found using a static code analysis program called cppcheck
>
> Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
> ---
>  drivers/staging/media/lirc/lirc_zilog.c |    4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)

>  	/* find our IR struct */
>  	struct IR *ir = filep->private_data;
>
> -	if (ir == NULL) {
> -		dev_err(ir->l.dev, "close: no private_data attached to the file!\n");

Yes, the dev_err() call is an obvious thinko.

However, I'm not sure whether removing it entirely is right either.  If
there *should* be a struct IR * passed there, maybe some other printk()
should be issued, or even a WARN_ON(!ir), or something?

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