linux-kernel - [PATCH 10/22] gpiolib: cdev: fix minor race in GET_LINEINFO

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Message-Id: <20200623040107.22270-11-warthog618@gmail.com>
Date:   Tue, 23 Jun 2020 12:00:55 +0800
From:   Kent Gibson <warthog618@...il.com>
To:     linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        bgolaszewski@...libre.com, linus.walleij@...aro.org
Cc:     Kent Gibson <warthog618@...il.com>
Subject: [PATCH 10/22] gpiolib: cdev: fix minor race in GET_LINEINFO_WATCH

Merge separate usage of test_bit/set_bit into test_and_set_bit to remove
the possibility of a race between the test and set.

Similarly test_bit and clear_bit.

In the existing code it is possible for two threads to race past the
test_bit and then set or clear the watch bit, and neither return EBUSY.

Signed-off-by: Kent Gibson <warthog618@...il.com>

---
 drivers/gpio/gpiolib-cdev.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index 5f5b715ed7f7..a727709b24a9 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -889,7 +889,7 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 		hwgpio = gpio_chip_hwgpio(desc);
 
-		if (test_bit(hwgpio, gcdev->watched_lines))
+		if (test_and_set_bit(hwgpio, gcdev->watched_lines))
 			return -EBUSY;
 
 		gpio_desc_to_lineinfo(desc, &lineinfo);
@@ -897,7 +897,6 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		if (copy_to_user(ip, &lineinfo, sizeof(lineinfo)))
 			return -EFAULT;
 
-		set_bit(hwgpio, gcdev->watched_lines);
 		return 0;
 	} else if (cmd == GPIO_GET_LINEINFO_UNWATCH_IOCTL) {
 		if (copy_from_user(&offset, ip, sizeof(offset)))
@@ -909,10 +908,9 @@ static long gpio_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 
 		hwgpio = gpio_chip_hwgpio(desc);
 
-		if (!test_bit(hwgpio, gcdev->watched_lines))
+		if (!test_and_clear_bit(hwgpio, gcdev->watched_lines))
 			return -EBUSY;
 
-		clear_bit(hwgpio, gcdev->watched_lines);
 		return 0;
 	}
 	return -EINVAL;
-- 
2.27.0