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Message-Id: <20210315135544.723265412@linuxfoundation.org>
Date: Mon, 15 Mar 2021 14:52:56 +0100
From: gregkh@...uxfoundation.org
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Saravana Kannan <saravanak@...gle.com>,
Johan Hovold <johan@...nel.org>,
Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 5.10 083/290] gpio: fix gpio-device list corruption
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
From: Johan Hovold <johan@...nel.org>
commit cf25ef6b631c6fc6c0435fc91eba8734cca20511 upstream.
Make sure to hold the gpio_lock when removing the gpio device from the
gpio_devices list (when dropping the last reference) to avoid corrupting
the list when there are concurrent accesses.
Fixes: ff2b13592299 ("gpio: make the gpiochip a real device")
Cc: stable@...r.kernel.org # 4.6
Reviewed-by: Saravana Kannan <saravanak@...gle.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
[ johan: adjust context to 5.11 ]
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/gpio/gpiolib.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -468,8 +468,12 @@ EXPORT_SYMBOL_GPL(gpiochip_line_is_valid
static void gpiodevice_release(struct device *dev)
{
struct gpio_device *gdev = dev_get_drvdata(dev);
+ unsigned long flags;
+ spin_lock_irqsave(&gpio_lock, flags);
list_del(&gdev->list);
+ spin_unlock_irqrestore(&gpio_lock, flags);
+
ida_free(&gpio_ida, gdev->id);
kfree_const(gdev->label);
kfree(gdev->descs);
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