linux-kernel - [PATCH v2] Input: bma150: fix ref count leak in bma150

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Message-Id: <20200615063534.80497-1-navid.emamdoost@gmail.com>
Date:   Mon, 15 Jun 2020 01:35:33 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        Paweł Chmiel <pawel.mikolaj.chmiel@...il.com>,
        Jonathan Bakker <xc-racer2@...e.ca>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     emamd001@....edu, wu000273@....edu, kjlu@....edu,
        mccamant@...umn.edu, andy.shevchenko@...il.com
Subject: [PATCH v2] Input: bma150: fix ref count leak in bma150_open

in bma150_open, pm_runtime_get_sync is called which
increments the counter even in case of failure, leading to incorrect
ref count. In case of failure, decrement the ref count before returning.

Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
---
Changes in v2:
	-- repplace pm_runtime_put with pm_runtime_put_noidle
---
 drivers/input/misc/bma150.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/input/misc/bma150.c b/drivers/input/misc/bma150.c
index a9d984da95f3..ec394b4faa14 100644
--- a/drivers/input/misc/bma150.c
+++ b/drivers/input/misc/bma150.c
@@ -348,7 +348,7 @@ static int bma150_open(struct input_dev *input)
 
 	error = pm_runtime_get_sync(&bma150->client->dev);
 	if (error < 0 && error != -ENOSYS)
-		return error;
+		goto out;
 
 	/*
 	 * See if runtime PM woke up the device. If runtime PM
@@ -357,10 +357,13 @@ static int bma150_open(struct input_dev *input)
 	if (bma150->mode != BMA150_MODE_NORMAL) {
 		error = bma150_set_mode(bma150, BMA150_MODE_NORMAL);
 		if (error)
-			return error;
+			goto out;
 	}
 
 	return 0;
+out:
+	pm_runtime_put_noidle(&bma150->client->dev);
+	return error;
 }
 
 static void bma150_close(struct input_dev *input)
-- 
2.17.1