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

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: <1437433372-15425-1-git-send-email-dmitry.torokhov@gmail.com>
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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/