gpio: mockup: fix NULL pointer dereference when removing debugfs

commit b7df41a6f79dfb18ba2203f8c5f0e9c0b9b57f68 upstream.

We now remove the device's debugfs entries when unbinding the driver.
This now causes a NULL-pointer dereference on module exit because the
platform devices are unregistered *after* the global debugfs directory
has been recursively removed. Fix it by unregistering the devices first.

Fixes: 303e6da99429 ("gpio: mockup: remove gpio debugfs when remove device")
Cc: Wei Yongjun <weiyongjun1@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index 780cba4e30d0e7badfbb6f025855e871b2142ce0..876027fdefc9543e4835839cbe2939a8671c8918 100644 (file)
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -604,9 +604,9 @@ static int __init gpio_mockup_init(void)
 
 static void __exit gpio_mockup_exit(void)
 {
+       gpio_mockup_unregister_pdevs();
        debugfs_remove_recursive(gpio_mockup_dbg_dir);
        platform_driver_unregister(&gpio_mockup_driver);
-       gpio_mockup_unregister_pdevs();
 }
 
 module_init(gpio_mockup_init);