linux-kernel - Re: [PATCH v2] mtd: spi-nor: Fix S3AN addressing calculation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <b62e4978-3a99-248e-533f-7fde6a378dd7@atmel.com>
Date:   Fri, 20 Jan 2017 14:26:08 +0100
From:   Cyrille Pitchen <cyrille.pitchen@...el.com>
To:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Brian Norris <computersforpeace@...il.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Richard Weinberger <richard@....at>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mtd: spi-nor: Fix S3AN addressing calculation

Le 18/01/2017 à 17:40, Ricardo Ribalda Delgado a écrit :
> The page calculation under spi_nor_s3an_addr_convert() was wrong. On
> Default Address Mode we need to perform a divide by page_size.
> 
> Fixes: 61cba34bd6c1 ("mtd: spi-nor: Add support for S3AN spi-nor devices")
> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Reviewed-by: Cyrille Pitchen <cyrille.pitchen@...el.com>

Marek, any comment on your side?

> ---
> 
> v2: Suggested by Marek Vasut <marek.vasut@...il.com>
>   -Use more descriptive name for page
> 
>  drivers/mtd/spi-nor/spi-nor.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index 2a643a1bb45e..f5c3ce8ac48b 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -431,11 +431,14 @@ static void spi_nor_unlock_and_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
>   */
>  static loff_t spi_nor_s3an_addr_convert(struct spi_nor *nor, unsigned int addr)
>  {
> -	unsigned int offset = addr;
> +	unsigned int offset;
> +	unsigned int page;
>  
> -	offset %= nor->page_size;
> +	offset = addr % nor->page_size;
> +	page = addr / nor->page_size;
> +	page <<= (nor->page_size > 512) ? 10 : 9;
>  
> -	return ((addr - offset) << 1) | offset;
> +	return page | offset;
>  }
>  
>  /*
>