From: Alexandre Belloni <alexandre.belloni@bootlin.com>
To: Alessandro Zummo <a.zummo@towertech.it>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Bartosz Golaszewski <bgolaszewski@baylibre.com>
Cc: linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] rtc: fix RTC removal
Date: Sun, 6 Dec 2020 00:14:48 +0100 [thread overview]
Message-ID: <20201205231449.610980-1-alexandre.belloni@bootlin.com> (raw)
Since the rtc_register_device, removing an RTC device will end with a
refcount_t: underflow; use-after-free warning since put_device is called
twice in the device tear down path.
Fixes: fdcfd854333b ("rtc: rework rtc_register_device() resource management")
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
drivers/rtc/class.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index e6b44b7c4ad3..5c6748dfa55d 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -335,7 +335,6 @@ static void devm_rtc_unregister_device(void *data)
cdev_device_del(&rtc->char_dev, &rtc->dev);
rtc->ops = NULL;
mutex_unlock(&rtc->ops_lock);
- put_device(&rtc->dev);
}
static void devm_rtc_release_device(void *res)
--
2.28.0
next reply other threads:[~2020-12-05 23:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-05 23:14 Alexandre Belloni [this message]
2020-12-07 9:51 ` [PATCH] rtc: fix RTC removal Bartosz Golaszewski
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