hwmon: (pmbus) Fix krealloc() misuse in pmbus_add_attribute()

If krealloc() returns NULL, it *doesn't* free the original. So any code
of the form 'foo = krealloc(foo, …);' is almost certainly a bug.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

1 files changed, 7 insertions, 5 deletions

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 80eef50c50fd..9add60920ac0 100644
--- a/drivers/hwmon/pmbus/pmbus_core.c
+++ b/drivers/hwmon/pmbus/pmbus_core.c
@@ -766,12 +766,14 @@ static ssize_t pmbus_show_label(struct device *dev,
 static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr)
 {
         if (data->num_attributes >= data->max_attributes - 1) {
-                data->max_attributes += PMBUS_ATTR_ALLOC_SIZE;
-                data->group.attrs = krealloc(data->group.attrs,
-                                             sizeof(struct attribute *) *
-                                             data->max_attributes, GFP_KERNEL);
-                if (data->group.attrs == NULL)
+                int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE;
+                void *new_attrs = krealloc(data->group.attrs,
+                                           new_max_attrs * sizeof(void *),
+                                           GFP_KERNEL);
+                if (!new_attrs)
                         return -ENOMEM;
+                data->group.attrs = new_attrs;
+                data->max_attributes = new_max_attrs;
         }
 
         data->group.attrs[data->num_attributes++] = attr;