linux-kernel - Re: [PATCH][spi-next] spi: stm32: fix range limit checks on div

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Date:   Fri, 23 Jun 2017 14:42:07 +0200
From:   Amelie DELAUNAY <amelie.delaunay@...com>
To:     Colin King <colin.king@...onical.com>,
        Mark Brown <broonie@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        <linux-spi@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>
CC:     <kernel-janitors@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][spi-next] spi: stm32: fix range limit checks on div


On 06/22/2017 05:41 PM, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently the check for range limits on div is incorrect and will
> never return -EINVAL. Fix this by replacing && with ||
> 
> Detected by CoverityScan, CID#1446580 ("Structurally dead code")
> 
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>   drivers/spi/spi-stm32.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/spi/spi-stm32.c b/drivers/spi/spi-stm32.c
> index 0553f61ab3b7..b75909e7b117 100644
> --- a/drivers/spi/spi-stm32.c
> +++ b/drivers/spi/spi-stm32.c
> @@ -262,7 +262,7 @@ static int stm32_spi_prepare_mbr(struct stm32_spi *spi, u32 speed_hz)
>   	 * no need to check it there.
>   	 * However, we need to ensure the following calculations.
>   	 */
> -	if ((div < SPI_MBR_DIV_MIN) &&
> +	if ((div < SPI_MBR_DIV_MIN) ||
>   	    (div > SPI_MBR_DIV_MAX))
>   		return -EINVAL;
>   
> 

Reviewed-by: Amelie Delaunay <amelie.delaunay@...com>