linux-kernel - Re: [PATCH] ASoC: qcom: sm8250: Fix array out of bounds access

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Message-ID: <4fc6b58a-e3e6-b57e-7ae7-16fd32392bcb@canonical.com>
Date:   Wed, 28 Oct 2020 14:24:10 +0000
From:   Colin Ian King <colin.king@...onical.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        broonie@...nel.org
Cc:     perex@...ex.cz, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, lgirdwood@...il.com
Subject: Re: [PATCH] ASoC: qcom: sm8250: Fix array out of bounds access

On 28/10/2020 14:20, Srinivas Kandagatla wrote:
> Static analysis Coverity had detected a potential array out-of-bounds
> write issue due to the fact that MAX AFE port Id was set to 16 instead
> of using AFE_PORT_MAX macro.
> 
> Fix this by properly using AFE_PORT_MAX macro.
> 
> Fixes: aa2e2785545a ("ASoC: qcom: sm8250: add sound card qrb5165-rb5 support")
> Reported-by: Colin Ian King <colin.king@...onical.com>
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  sound/soc/qcom/sm8250.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/sound/soc/qcom/sm8250.c b/sound/soc/qcom/sm8250.c
> index 7d43de6d909f..52c40512102f 100644
> --- a/sound/soc/qcom/sm8250.c
> +++ b/sound/soc/qcom/sm8250.c
> @@ -13,12 +13,11 @@
>  
>  #define DRIVER_NAME		"sm8250"
>  #define MI2S_BCLK_RATE		1536000
> -#define MAX_SDW_STREAMS		16
>  
>  struct sm8250_snd_data {
> -	bool stream_prepared[MAX_SDW_STREAMS];
> +	bool stream_prepared[AFE_PORT_MAX];
>  	struct snd_soc_card *card;
> -	struct sdw_stream_runtime *sruntime[MAX_SDW_STREAMS];
> +	struct sdw_stream_runtime *sruntime[AFE_PORT_MAX];
>  };
>  
>  static int sm8250_be_hw_params_fixup(struct snd_soc_pcm_runtime *rtd,
> 

Thanks, looks good to me.

Reviewed-by: Colin Ian King <colin.king@...onical.com>