linux-kernel - [PATCH 1/4] RTC: fix double free in rtc_register

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Date:	Mon, 20 Jul 2015 16:02:49 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Alessandro Zummo <a.zummo@...ertech.it>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
	Vasiliy Kulikov <segooon@...il.com>
Subject: [PATCH 1/4] RTC: fix double free in rtc_register_device() error path

Commit 59cca865f21e9e7beab73fcf79ba4eb776a4c228 correctly noted that naked
kfree() should not be used after failed device_register() call, however,
while it added the needed put_device() it forgot to remove the original
kfree() causing double-free.

Cc: Vasiliy Kulikov <segooon@...il.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
---
 drivers/rtc/class.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index ea2a315..eb82ec2 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -234,8 +234,9 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
 
 	err = device_register(&rtc->dev);
 	if (err) {
+		/* This will free both memory and the ID */
 		put_device(&rtc->dev);
-		goto exit_kfree;
+		goto exit;
 	}
 
 	rtc_dev_add_device(rtc);
@@ -247,9 +248,6 @@ struct rtc_device *rtc_device_register(const char *name, struct device *dev,
 
 	return rtc;
 
-exit_kfree:
-	kfree(rtc);
-
 exit_ida:
 	ida_simple_remove(&rtc_ida, id);
 
-- 
2.4.3.573.g4eafbef

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