linux-kernel - Re: [PATCH 1/2] staging: wfx: fix use of uninitialized pointer

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Date:   Mon, 19 Oct 2020 18:07:54 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     Jerome Pouiller <Jerome.Pouiller@...abs.com>
Cc:     devel@...verdev.osuosl.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>,
        kernel test robot <lkp@...el.com>
Subject: Re: [PATCH 1/2] staging: wfx: fix use of uninitialized pointer

On Mon, Oct 19, 2020 at 06:06:03PM +0200, Jerome Pouiller wrote:
> From: Jérôme Pouiller <jerome.pouiller@...abs.com>
> 
> With -Wuninitialized, the compiler complains:
> 
> drivers/staging/wfx/data_tx.c:34:19: warning: variable 'band' is uninitialized when used here [-Wuninitialized]
>     if (rate->idx >= band->n_bitrates) {
>                          ^~~~
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Nathan Chancellor <natechancellor@...il.com>
> Fixes: 868fd970e187 ("staging: wfx: improve robustness of wfx_get_hw_rate()")
> Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>

> ---
>  drivers/staging/wfx/data_tx.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/wfx/data_tx.c b/drivers/staging/wfx/data_tx.c
> index 41f6a604a697..36b36ef39d05 100644
> --- a/drivers/staging/wfx/data_tx.c
> +++ b/drivers/staging/wfx/data_tx.c
> @@ -31,13 +31,13 @@ static int wfx_get_hw_rate(struct wfx_dev *wdev,
>  		}
>  		return rate->idx + 14;
>  	}
> -	if (rate->idx >= band->n_bitrates) {
> -		WARN(1, "wrong rate->idx value: %d", rate->idx);
> -		return -1;
> -	}
>  	// WFx only support 2GHz, else band information should be retrieved
>  	// from ieee80211_tx_info
>  	band = wdev->hw->wiphy->bands[NL80211_BAND_2GHZ];
> +	if (rate->idx >= band->n_bitrates) {
> +		WARN(1, "wrong rate->idx value: %d", rate->idx);
> +		return -1;
> +	}
>  	return band->bitrates[rate->idx].hw_value;
>  }
>  
> -- 
> 2.28.0
>