linux-kernel - Re: [PATCH v2] mmc: core: Fix size overflow for mmc partitions

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Message-ID: <CAPDyKFokrmxu8CLOTVjtbzf3sMQcLahVqAtYP5X=wnqST5+Zdg@mail.gmail.com>
Date:   Thu, 14 Nov 2019 12:12:01 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Bradley Bolen <bradleybolen@...il.com>
Cc:     "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Avri Altman <avri.altman@....com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        "yinbo.zhu" <yinbo.zhu@....com>,
        Hongjie Fang <hongjiefang@...micro.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] mmc: core: Fix size overflow for mmc partitions

On Thu, 7 Nov 2019 at 04:26, Bradley Bolen <bradleybolen@...il.com> wrote:
>
> With large eMMC cards, it is possible to create general purpose
> partitions that are bigger than 4GB.  The size member of the mmc_part
> struct is only an unsigned int which overflows for gp partitions larger
> than 4GB.  Change this to a u64 to handle the overflow.
>
> Signed-off-by: Bradley Bolen <bradleybolen@...il.com>
> ---
>  drivers/mmc/core/mmc.c   | 6 +++---
>  include/linux/mmc/card.h | 2 +-
>  2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index c880489..fc02124 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -297,7 +297,7 @@ static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
>         }
>  }
>
> -static void mmc_part_add(struct mmc_card *card, unsigned int size,
> +static void mmc_part_add(struct mmc_card *card, u64 size,
>                          unsigned int part_cfg, char *name, int idx, bool ro,
>                          int area_type)
>  {
> @@ -313,7 +313,7 @@ static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
>  {
>         int idx;
>         u8 hc_erase_grp_sz, hc_wp_grp_sz;
> -       unsigned int part_size;
> +       u64 part_size;

There is also a cast to a "size_t" while computing the part_size in
mmc_manage_gp_partitions(). Should we remove that as well?

[...]

Kind regards
Uffe