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: 41eb374ae751 ("hwmon: Add amd_energy driver to report energy counters")
Signed-off-by: David Arcari <darcari@redhat.com>
Cc: Naveen Krishna Chatradhi <nchatrad@amd.com>
Cc: Jean Delvare <jdelvare@suse.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: linux-kernel@vger.kernel.org
Cc: stable@vger.kernel.org
Signed-off-by: David Arcari <darcari@redhat.com>
Acked-by: Naveen Krishna Chatradhi <nchatrad@amd.com>
Link: https://lore.kernel.org/r/20210107144707.6927-1-darcari@redhat.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/amd_energy.c b/drivers/hwmon/amd_energy.c
index 9b306448b7a0f57ae45cacd4090ef4aaa7a1e2f5..822c2e74b98d4713927136d3e2344bb96244f7fb 100644 (file)
--- 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;
 }