linux-kernel - [PATCH] hwmon: (pmbus) Fix krealloc() misuse in pmbus_add

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Date:	Thu, 14 Mar 2013 13:30:20 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	Jean Delvare <khali@...ux-fr.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] 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@...el.com>
---
 drivers/hwmon/pmbus/pmbus_core.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/hwmon/pmbus/pmbus_core.c b/drivers/hwmon/pmbus/pmbus_core.c
index 80eef50..9add6092 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;
-- 
1.8.1.4


-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

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