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

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Message-Id: <20210107144707.6927-1-darcari@redhat.com>
Date:   Thu,  7 Jan 2021 09:47:07 -0500
From:   David Arcari <darcari@...hat.com>
To:     linux-hwmon@...r.kernel.org
Cc:     David Arcari <darcari@...hat.com>,
        Naveen Krishna Chatradhi <nchatrad@....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

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>
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