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

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Message-ID: <DM6PR12MB4388220A9F55F5DDC984B91FE8AE0@DM6PR12MB4388.namprd12.prod.outlook.com>
Date:   Fri, 8 Jan 2021 05:49:03 +0000
From:   "Chatradhi, Naveen Krishna" <NaveenKrishna.Chatradhi@....com>
To:     David Arcari <darcari@...hat.com>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>
CC:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>,
        "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

[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>

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