linux-kernel - Re: [PATCH] hwmon: (amd_energy) fix allocation of hwmon_channel

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Date:   Thu, 7 Jan 2021 22:17:12 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Chatradhi, Naveen Krishna" <NaveenKrishna.Chatradhi@....com>,
        David Arcari <darcari@...hat.com>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>
Cc:     Jean Delvare <jdelvare@...e.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] hwmon: (amd_energy) fix allocation of hwmon_channel_info
 config

On 1/7/21 9:49 PM, Chatradhi, Naveen Krishna wrote:
> [AMD Official Use Only - Approved for External Use]
> 
> Hi David,
> 
> Thank you for noticing and submitting a fix. You may use
> Signed-off-by: Naveen Krishna Chatradhi <nchatrad@....com>
> 

No, because you are not in the approval path (you did not send the patch
to me). Reviewed-by: or Acked-by: would be more appropriate.

Genter

> Regards,
> Naveenk
> 
> -----Original Message-----
> From: David Arcari <darcari@...hat.com> 
> Sent: Thursday, January 7, 2021 8:17 PM
> To: linux-hwmon@...r.kernel.org
> Cc: David Arcari <darcari@...hat.com>; Chatradhi, Naveen Krishna <NaveenKrishna.Chatradhi@....com>; Jean Delvare <jdelvare@...e.com>; Guenter Roeck <linux@...ck-us.net>; linux-kernel@...r.kernel.org; stable@...r.kernel.org
> Subject: [PATCH] hwmon: (amd_energy) fix allocation of hwmon_channel_info config
> 
> [CAUTION: External Email]
> 
> hwmon, specifically hwmon_num_channel_attrs, expects the config array in the hwmon_channel_info structure to be terminated by a zero entry.  amd_energy does not honor this convention.  As result, a KASAN warning is possible.  Fix this by adding an additional entry and setting it to zero.
> 
> Fixes: 8abee9566b7e ("hwmon: Add amd_energy driver to report energy counters")
> 
> Signed-off-by: David Arcari <darcari@...hat.com>
> Cc: Naveen Krishna Chatradhi <nchatrad@....com>
> [naveenk:] Signed-off-by: Naveen Krishna Chatradhi <nchatrad@....com>
> Cc: Jean Delvare <jdelvare@...e.com>
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: linux-kernel@...r.kernel.org
> Cc: stable@...r.kernel.org
> ---
>  drivers/hwmon/amd_energy.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/amd_energy.c b/drivers/hwmon/amd_energy.c index 9b306448b7a0..822c2e74b98d 100644
> --- a/drivers/hwmon/amd_energy.c
> +++ b/drivers/hwmon/amd_energy.c
> @@ -222,7 +222,7 @@ static int amd_create_sensor(struct device *dev,
>          */
>         cpus = num_present_cpus() / num_siblings;
> 
> -       s_config = devm_kcalloc(dev, cpus + sockets,
> +       s_config = devm_kcalloc(dev, cpus + sockets + 1,
>                                 sizeof(u32), GFP_KERNEL);
>         if (!s_config)
>                 return -ENOMEM;
> @@ -254,6 +254,7 @@ static int amd_create_sensor(struct device *dev,
>                         scnprintf(label_l[i], 10, "Esocket%u", (i - cpus));
>         }
> 
> +       s_config[i] = 0;
>         return 0;
>  }
> 
> --
> 2.18.1
>