linux-kernel - Re: [PATCH v2] ALSA: i2c: ak4xxx-adda: Fix a possible null pointer dereference in build_adc

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Date:   Fri, 26 Jul 2019 14:26:31 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     "Jia-Ju Bai" <baijiaju1990@...il.com>
Cc:     <tglx@...utronix.de>, <gregkh@...uxfoundation.org>,
        <perex@...ex.cz>, <rfontana@...hat.com>,
        <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ALSA: i2c: ak4xxx-adda: Fix a possible null pointer dereference in build_adc_controls()

On Fri, 26 Jul 2019 04:14:42 +0200,
Jia-Ju Bai wrote:
> 
> In build_adc_controls(), there is an if statement on line 773 to check
> whether ak->adc_info is NULL:
>     if (! ak->adc_info ||
>         ! ak->adc_info[mixer_ch].switch_name)
> 
> When ak->adc_info is NULL, it is used on line 792:
>     knew.name = ak->adc_info[mixer_ch].selector_name;
> 
> Thus, a possible null-pointer dereference may occur.
> 
> To fix this bug, referring to lines 773 and 774, ak->adc_info
> and ak->adc_info[mixer_ch].selector_name are checked before being used.
> 
> This bug is found by a static analysis tool STCheck written by us.
> 
> Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>

Applied, thanks.


Takashi