linux-kernel - Re: [PATCH] greybus: audio_codec: fix three missing initializers for data

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Date:   Mon, 28 Mar 2022 13:44:09 +0530
From:   Vaibhav Agarwal <vaibhav.sr@...il.com>
To:     Xiaomeng Tong <xiam0nd.tong@...il.com>
Cc:     Mark Greer <mgreer@...malcreek.com>,
        Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "moderated list:GREYBUS SUBSYSTEM" <greybus-dev@...ts.linaro.org>,
        linux-staging@...ts.linux.dev,
        open list <linux-kernel@...r.kernel.org>,
        stable@...r.kernel.org
Subject: Re: [PATCH] greybus: audio_codec: fix three missing initializers for data

On Sun, Mar 27, 2022 at 11:31 AM Xiaomeng Tong <xiam0nd.tong@...il.com> wrote:
>
> These three bugs are here:
>         struct gbaudio_data_connection *data;
>
> If the list '&codec->module_list' is empty then the 'data' will
> keep unchanged. However, the 'data' is not initialized and filled
> with trash value. As a result, if the value is not NULL, the check
> 'if (!data) {' will always be false and never exit expectly.
>
> To fix these bug, just initialize 'data' with NULL.
>
> Cc: stable@...r.kernel.org
> Fixes: 6dd67645f22cf ("greybus: audio: Use single codec driver registration")
> Signed-off-by: Xiaomeng Tong <xiam0nd.tong@...il.com>
> ---
>  drivers/staging/greybus/audio_codec.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/staging/greybus/audio_codec.c b/drivers/staging/greybus/audio_codec.c
> index b589cf6b1d03..939e05af4dcf 100644
> --- a/drivers/staging/greybus/audio_codec.c
> +++ b/drivers/staging/greybus/audio_codec.c
> @@ -397,7 +397,7 @@ static int gbcodec_hw_params(struct snd_pcm_substream *substream,
>         u8 sig_bits, channels;
>         u32 format, rate;
>         struct gbaudio_module_info *module;
> -       struct gbaudio_data_connection *data;
> +       struct gbaudio_data_connection *data = NULL;
>         struct gb_bundle *bundle;
>         struct gbaudio_codec_info *codec = dev_get_drvdata(dai->dev);
>         struct gbaudio_stream_params *params;
> @@ -498,7 +498,7 @@ static int gbcodec_prepare(struct snd_pcm_substream *substream,
>  {
>         int ret;
>         struct gbaudio_module_info *module;
> -       struct gbaudio_data_connection *data;
> +       struct gbaudio_data_connection *data = NULL;
>         struct gb_bundle *bundle;
>         struct gbaudio_codec_info *codec = dev_get_drvdata(dai->dev);
>         struct gbaudio_stream_params *params;
> @@ -562,7 +562,7 @@ static int gbcodec_prepare(struct snd_pcm_substream *substream,
>  static int gbcodec_mute_stream(struct snd_soc_dai *dai, int mute, int stream)
>  {
>         int ret;
> -       struct gbaudio_data_connection *data;
> +       struct gbaudio_data_connection *data = NULL;
>         struct gbaudio_module_info *module;
>         struct gb_bundle *bundle;
>         struct gbaudio_codec_info *codec = dev_get_drvdata(dai->dev);
> --
> 2.17.1
>
Thanks Xiaomeng for sharing the fix.

Reviewed by: Vaibhav Agarwal <vaibhav.sr@...il.com>