linux-kernel - Re: [patch] ASoC: hdac_hdmi: Potential NULL deref in hdac_hdmi_get_spk

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Message-ID: <20160503095639.GS2274@localhost>
Date:	Tue, 3 May 2016 15:26:39 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Liam Girdwood <lgirdwood@...il.com>,
	"Subhransu S. Prusty" <subhransu.s.prusty@...el.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, Jeeja KP <jeeja.kp@...el.com>,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	Arnd Bergmann <arnd@...db.de>, alsa-devel@...a-project.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] ASoC: hdac_hdmi: Potential NULL deref in
 hdac_hdmi_get_spk_alloc()

On Tue, May 03, 2016 at 10:42:58AM +0300, Dan Carpenter wrote:
> We intended || here instead of &&.  The original code potentially leads
> to a NULL dereference.

This looks good to me, I will test this and get back

> 
> Fixes: 2889099eb8cd ('ASoC: hdac_hdmi: Register chmap controls and ops')
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> diff --git a/sound/soc/codecs/hdac_hdmi.c b/sound/soc/codecs/hdac_hdmi.c
> index 3043120..7e7ff1b 100644
> --- a/sound/soc/codecs/hdac_hdmi.c
> +++ b/sound/soc/codecs/hdac_hdmi.c
> @@ -1609,7 +1609,7 @@ static int hdac_hdmi_get_spk_alloc(struct hdac_device *hdac, int pcm_idx)
>  	struct hdac_hdmi_pcm *pcm = get_hdmi_pcm_from_id(hdmi, pcm_idx);
>  	struct hdac_hdmi_pin *pin = pcm->pin;
>  
> -	if (!pin && !pin->eld.eld_valid)
> +	if (!pin || !pin->eld.eld_valid)
>  		return 0;
>  
>  	return pin->eld.info.spk_alloc;

-- 
~Vinod