gpio fixes for v7.1-rc5

- propagate the error code from regulator_enable() in resume path in
   gpio-pca953x
 - take the device lock when calling device_is_bound() in virtual GPIO
   drivers
 - fix software node leak in remove path in gpio-aggregator
 - fix a potential use-after-free in gpio-aggregator
 - harden the GPIO character device uAPI: check that line config
   attributes are correctly zeroed
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Merge tag 'gpio-fixes-for-v7.1-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux

Pull gpio fixes from Bartosz Golaszewski:

 - propagate the error code from regulator_enable() in resume path in
   gpio-pca953x

 - take the device lock when calling device_is_bound() in virtual GPIO
   drivers

 - fix software node leak in remove path in gpio-aggregator

 - fix a potential use-after-free in gpio-aggregator

 - harden the GPIO character device uAPI: check that line config
   attributes are correctly zeroed

* tag 'gpio-fixes-for-v7.1-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
  gpio: virtuser: lock device when calling device_is_bound()
  gpio: aggregator: lock device when calling device_is_bound()
  gpio: sim: lock device when calling device_is_bound()
  gpio: aggregator: remove the software node when deactivating the aggregator
  gpio: aggregator: fix a potential use-after-free
  gpio: cdev: check if uAPI v2 config attributes are correctly zeroed
  gpio: pca953x: propagate regulator_enable() error from resume

drivers/gpio/gpio-aggregator.c

@@ -968,9 +968,12 @@ static int gpio_aggregator_activate(struct gpio_aggregator *aggr)
 	}
 
 	wait_for_device_probe();
-	if (!device_is_bound(&pdev->dev)) {
-		ret = -ENXIO;
-		goto err_unregister_pdev;
+
+	scoped_guard(device, &pdev->dev) {
+		if (!device_is_bound(&pdev->dev)) {
+			ret = -ENXIO;
+			goto err_unregister_pdev;
+		}
 	}
 
 	aggr->pdev = pdev;
@@ -979,8 +982,8 @@ static int gpio_aggregator_activate(struct gpio_aggregator *aggr)
 err_unregister_pdev:
 	platform_device_unregister(pdev);
 err_remove_lookup_table:
-	kfree(aggr->lookups->dev_id);
 	gpiod_remove_lookup_table(aggr->lookups);
+	kfree(aggr->lookups->dev_id);
 err_remove_swnode:
 	fwnode_remove_software_node(swnode);
 err_remove_lookups:
@@ -991,11 +994,15 @@ err_remove_lookups:
 
 static void gpio_aggregator_deactivate(struct gpio_aggregator *aggr)
 {
+	struct fwnode_handle *swnode;
+
+	swnode = dev_fwnode(&aggr->pdev->dev);
 	platform_device_unregister(aggr->pdev);
 	aggr->pdev = NULL;
 	gpiod_remove_lookup_table(aggr->lookups);
 	kfree(aggr->lookups->dev_id);
 	kfree(aggr->lookups);
+	fwnode_remove_software_node(swnode);
 }
 
 static void gpio_aggregator_lockup_configfs(struct gpio_aggregator *aggr,

drivers/gpio/gpio-pca953x.c

@@ -1411,7 +1411,7 @@ static int pca953x_resume(struct device *dev)
 		ret = regulator_enable(chip->regulator);
 		if (ret) {
 			dev_err(dev, "Failed to enable regulator: %d\n", ret);
-			return 0;
+			return ret;
 		}
 	}
 

drivers/gpio/gpio-sim.c

@@ -901,7 +901,7 @@ static int gpio_sim_device_activate(struct gpio_sim_device *dev)
 	struct platform_device *pdev;
 	struct fwnode_handle *swnode;
 	struct gpio_sim_bank *bank;
-	int ret;
+	int ret = 0;
 
 	lockdep_assert_held(&dev->lock);
 
@@ -945,9 +945,12 @@ static int gpio_sim_device_activate(struct gpio_sim_device *dev)
 	}
 
 	wait_for_device_probe();
-	if (!device_is_bound(&pdev->dev)) {
-		ret = -ENXIO;
-		goto err_unregister_pdev;
+
+	scoped_guard(device, &pdev->dev) {
+		if (!device_is_bound(&pdev->dev)) {
+			ret = -ENXIO;
+			goto err_unregister_pdev;
+		}
 	}
 
 	dev->pdev = pdev;

drivers/gpio/gpio-virtuser.c

@@ -1477,9 +1477,12 @@ gpio_virtuser_device_activate(struct gpio_virtuser_device *dev)
 	}
 
 	wait_for_device_probe();
-	if (!device_is_bound(&pdev->dev)) {
-		ret = -ENXIO;
-		goto err_unregister_pdev;
+
+	scoped_guard(device, &pdev->dev) {
+		if (!device_is_bound(&pdev->dev)) {
+			ret = -ENXIO;
+			goto err_unregister_pdev;
+		}
 	}
 
 	dev->pdev = pdev;

drivers/gpio/gpiolib-cdev.c

@@ -1184,6 +1184,7 @@ static int gpio_v2_line_flags_validate(u64 flags)
 static int gpio_v2_line_config_validate(struct gpio_v2_line_config *lc,
 					unsigned int num_lines)
 {
+	size_t unused_attrs;
 	unsigned int i;
 	u64 flags;
 	int ret;
@@ -1191,9 +1192,21 @@ static int gpio_v2_line_config_validate(struct gpio_v2_line_config *lc,
 	if (lc->num_attrs > GPIO_V2_LINE_NUM_ATTRS_MAX)
 		return -EINVAL;
 
+	unused_attrs = GPIO_V2_LINE_NUM_ATTRS_MAX - lc->num_attrs;
+
 	if (!mem_is_zero(lc->padding, sizeof(lc->padding)))
 		return -EINVAL;
 
+	for (i = 0; i < lc->num_attrs; i++) {
+		if (lc->attrs[i].attr.padding != 0)
+			return -EINVAL;
+	}
+
+	if (unused_attrs) {
+		if (!mem_is_zero(&lc->attrs[lc->num_attrs], unused_attrs * sizeof(*lc->attrs)))
+			return -EINVAL;
+	}
+
 	for (i = 0; i < num_lines; i++) {
 		flags = gpio_v2_line_config_flags(lc, i);
 		ret = gpio_v2_line_flags_validate(flags);