* Re: [PATCH v2] mmc: dw_mmc-k3: Fix out-of-bounds access through DT alias
[not found] <1519389859-14947-1-git-send-email-geert+renesas@glider.be>
@ 2018-02-27 11:27 ` Ulf Hansson
0 siblings, 0 replies; only message in thread
From: Ulf Hansson @ 2018-02-27 11:27 UTC (permalink / raw)
To: Geert Uytterhoeven
Cc: Jaehoon Chung, linux-mmc@vger.kernel.org, devicetree-compiler,
Linux Kernel Mailing List
On 23 February 2018 at 13:44, Geert Uytterhoeven
<geert+renesas@glider.be> wrote:
> The hs_timing_cfg[] array is indexed using a value derived from the
> "mshcN" alias in DT, which may lead to an out-of-bounds access.
>
> Fix this by adding a range check.
>
> Fixes: 361c7fe9b02eee7e ("mmc: dw_mmc-k3: add sd support for hi3660")
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Thanks, applied for fixes!
Should we add a stable tag as well?
Kind regards
Uffe
> ---
> v2:
> - Fix Fixes reference.
>
> There is another possible out-of-bounds access in
> drivers/mmc/host/dw_mmc.c:dw_mci_init_slot():
>
> if (drv_data && drv_data->caps)
> mmc->caps |= drv_data->caps[ctrl_id];
>
> With ctrl_id derived from "mshcN".
>
> Unfortunately the upper bound is not known at run-time, without adding
> such a field to struct dw_mci_drv_data first.
> ---
> drivers/mmc/host/dw_mmc-k3.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c
> index 73fd75c3c824904d..75ae5803b0db24dd 100644
> --- a/drivers/mmc/host/dw_mmc-k3.c
> +++ b/drivers/mmc/host/dw_mmc-k3.c
> @@ -135,6 +135,9 @@ static int dw_mci_hi6220_parse_dt(struct dw_mci *host)
> if (priv->ctrl_id < 0)
> priv->ctrl_id = 0;
>
> + if (priv->ctrl_id >= TIMING_MODE)
> + return -EINVAL;
> +
> host->priv = priv;
> return 0;
> }
> --
> 2.7.4
>
^ permalink raw reply [flat|nested] only message in thread