linux-kernel - Re: [PATCH v2] staging: greybus: audio: fix uninitialized value issue

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Message-ID: <20200814105616.GP1793@kadam>
Date:   Fri, 14 Aug 2020 13:56:16 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Vaibhav Agarwal <vaibhav.sr@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alex Elder <elder@...nel.org>, Johan Hovold <johan@...nel.org>,
        Mark Greer <mgreer@...malcreek.com>,
        devel@...verdev.osuosl.org, greybus-dev@...ts.linaro.org,
        Colin Ian King <colin.king@...onical.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] staging: greybus: audio: fix uninitialized value issue

On Fri, Aug 14, 2020 at 01:07:20PM +0530, Vaibhav Agarwal wrote:
> The current implementation for gbcodec_mixer_dapm_ctl_put() uses
> uninitialized gbvalue for comparison with updated value. This was found
> using static analysis with coverity.
> 
> Uninitialized scalar variable (UNINIT)
> 11. uninit_use: Using uninitialized value
> gbvalue.value.integer_value[0].
> 460        if (gbvalue.value.integer_value[0] != val) {
> 
> This patch fixes the issue with fetching the gbvalue before using it for
>     comparision.
> 
> Fixes: 6339d2322c47 ("greybus: audio: Add topology parser for GB codec")
> Reported-by: Colin Ian King <colin.king@...onical.com>
> Signed-off-by: Vaibhav Agarwal <vaibhav.sr@...il.com>
> ---
> Changelog:
> v2: Fix the missing check for return value after get_control.
> ---
>  drivers/staging/greybus/audio_topology.c | 19 +++++++++++++------
>  1 file changed, 13 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c
> index 2f9fdbdcd547..9f98691b2f5f 100644
> --- a/drivers/staging/greybus/audio_topology.c
> +++ b/drivers/staging/greybus/audio_topology.c
> @@ -456,6 +456,18 @@ static int gbcodec_mixer_dapm_ctl_put(struct snd_kcontrol *kcontrol,
>  	val = ucontrol->value.integer.value[0] & mask;
>  	connect = !!val;
>  
> +	ret = gb_pm_runtime_get_sync(bundle);
> +	if (ret)
> +		return ret;
> +
> +	ret = gb_audio_gb_get_control(module->mgmt_connection, data->ctl_id,
> +				      GB_AUDIO_INVALID_INDEX, &gbvalue);
> +	if (ret) {
> +		dev_err_ratelimited(codec_dev, "%d:Error in %s for %s\n", ret,
> +				    __func__, kcontrol->id.name);

gb_pm_runtime_put_autosuspend(bundle) on this error path?

> +		return ret;
> +	}

regards,
dan carpenter