linux-kernel - [PATCH] hwmon: (core) fix resource leak on devm

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20161023205608.11867-1-colin.king@canonical.com>
Date:   Sun, 23 Oct 2016 21:56:08 +0100
From:   Colin King <colin.king@...onical.com>
To:     Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>, linux-hwmon@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] hwmon: (core) fix resource leak on devm_kcalloc failure

From: Colin Ian King <colin.king@...onical.com>

If dev_kcalloc fails to allocate hw_dev->groups then the current
exit path is a direct return, causing a leak of resources such
as hwdev and ida is not removed.  Fix this by exiting via the
free_hwmon exit path that performs the necessary resource cleanup.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/hwmon/hwmon.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index adae684..a74c075 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -536,8 +536,10 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 
 		hwdev->groups = devm_kcalloc(dev, ngroups, sizeof(*groups),
 					     GFP_KERNEL);
-		if (!hwdev->groups)
-			return ERR_PTR(-ENOMEM);
+		if (!hwdev->groups) {
+			err = -ENOMEM;
+			goto free_hwmon;
+		}
 
 		attrs = __hwmon_create_attrs(dev, drvdata, chip);
 		if (IS_ERR(attrs)) {
-- 
2.9.3