diff mbox series

[v2,1/1] gpio: mockup: Convert to use software nodes

Message ID 20211005093731.62743-1-andriy.shevchenko@linux.intel.com
State New
Headers show
Series [v2,1/1] gpio: mockup: Convert to use software nodes | expand

Commit Message

Andy Shevchenko Oct. 5, 2021, 9:37 a.m. UTC 
The gpio-mockup driver creates the properties that are shared between
platform and GPIO devices. Because of that, the properties may not
be removed at the proper point of time without provoking a use-after-free
as shown in the following backtrace:

  refcount_t: underflow; use-after-free.
  WARNING: CPU: 0 PID: 103 at lib/refcount.c:28 refcount_warn_saturate+0xd1/0x120
  ...
  Call Trace:
  kobject_put+0xdc/0xf0
  software_node_notify_remove+0xa8/0xc0
  device_del+0x15a/0x3e0

That's why the driver has to manage the lifetime of the software nodes
by itself.

The problem originates from the old device_add_properties() API, but
has been only revealed after the commit bd1e336aa853 ("driver core: platform:
Remove platform_device_add_properties()"). Hence, it's used as a landmark
for the backporting.

Fixes: bd1e336aa853 ("driver core: platform: Remove platform_device_add_properties()")
Reported-tested-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
v2: updated Fixes (Kent), added Tested-by (Kent), amended grammar a bit
 drivers/gpio/gpio-mockup.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

Comments

Andy Shevchenko Oct. 5, 2021, 9:43 a.m. UTC | #1 
On Tue, Oct 5, 2021 at 12:37 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:

> Reported-tested-by: Kent Gibson <warthog618@gmail.com>

Oopsista, should be "Reported-and-tested-by:". I hope you can fix it
when applying, but tell me if I need to send a v3.
Andy Shevchenko Oct. 5, 2021, 12:25 p.m. UTC | #2 
On Tue, Oct 05, 2021 at 12:43:57PM +0300, Andy Shevchenko wrote:
> On Tue, Oct 5, 2021 at 12:37 PM Andy Shevchenko
> <andriy.shevchenko@linux.intel.com> wrote:
> 
> > Reported-tested-by: Kent Gibson <warthog618@gmail.com>
> 
> Oopsista, should be "Reported-and-tested-by:". I hope you can fix it
> when applying, but tell me if I need to send a v3.

Nevermind. just sent a v3 to make everyone's life easier!
diff mbox series

Patch

diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index 0a9d746a0fe0..8b147b565e92 100644
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -478,8 +478,18 @@  static void gpio_mockup_unregister_pdevs(void)
 {
 	int i;
 
-	for (i = 0; i < GPIO_MOCKUP_MAX_GC; i++)
-		platform_device_unregister(gpio_mockup_pdevs[i]);
+	for (i = 0; i < GPIO_MOCKUP_MAX_GC; i++) {
+		struct platform_device *pdev;
+		struct fwnode_handle *fwnode;
+
+		pdev = gpio_mockup_pdevs[i];
+		if (!pdev)
+			continue;
+
+		fwnode = dev_fwnode(&pdev->dev);
+		platform_device_unregister(pdev);
+		fwnode_remove_software_node(fwnode);
+	}
 }
 
 static __init char **gpio_mockup_make_line_names(const char *label,
@@ -508,6 +518,7 @@  static int __init gpio_mockup_register_chip(int idx)
 	struct property_entry properties[GPIO_MOCKUP_MAX_PROP];
 	struct platform_device_info pdevinfo;
 	struct platform_device *pdev;
+	struct fwnode_handle *fwnode;
 	char **line_names = NULL;
 	char chip_label[32];
 	int prop = 0, base;
@@ -536,13 +547,18 @@  static int __init gpio_mockup_register_chip(int idx)
 					"gpio-line-names", line_names, ngpio);
 	}
 
+	fwnode = fwnode_create_software_node(properties, NULL);
+	if (IS_ERR(fwnode))
+		return PTR_ERR(fwnode);
+
 	pdevinfo.name = "gpio-mockup";
 	pdevinfo.id = idx;
-	pdevinfo.properties = properties;
+	pdevinfo.fwnode = fwnode;
 
 	pdev = platform_device_register_full(&pdevinfo);
 	kfree_strarray(line_names, ngpio);
 	if (IS_ERR(pdev)) {
+		fwnode_remove_software_node(fwnode);
 		pr_err("error registering device");
 		return PTR_ERR(pdev);
 	}