power_supply: Fix possible NULL pointer dereference on early uevent

Don't call the power_supply_changed() from power_supply_register() when
parent is still probing because it may lead to accessing parent too
early.

In bq27x00_battery this caused NULL pointer exception because uevent of
power_supply_changed called back the the get_property() method provided
by the driver. The get_property() method accessed pointer which should
be returned by power_supply_register().

Starting from bq27x00_battery_probe():
  di->bat = power_supply_register()
    power_supply_changed()
      kobject_uevent()
        power_supply_uevent()
          power_supply_show_property()
            power_supply_get_property()
              bq27x00_battery_get_property()
                dereference of di->bat which is NULL here

The dereference of di->bat (value returned by power_supply_register())
is the currently visible problem. However calling back the methods
provided by driver before ending the probe may lead to accessing other
driver-related data which is not yet initialized.

The call to power_supply_changed() is postponed till probing ends -
mutex of parent device is released.

Reported-by: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Fixes: 297d716f6260 ("power_supply: Change ownership from driver to core")
Tested-By: Dr. H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

1 files changed, 45 insertions, 5 deletions

diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index 15da277e0e8d..4bc0c7f459a5 100644
--- a/drivers/power/power_supply_core.c
+++ b/drivers/power/power_supply_core.c
@@ -30,6 +30,8 @@ EXPORT_SYMBOL_GPL(power_supply_notifier);
 
 static struct device_type power_supply_dev_type;
 
+#define POWER_SUPPLY_DEFERRED_REGISTER_TIME     msecs_to_jiffies(10)
+
 static bool __power_supply_is_supplied_by(struct power_supply *supplier,
                                          struct power_supply *supply)
 {
@@ -121,6 +123,30 @@ void power_supply_changed(struct power_supply *psy)
 }
 EXPORT_SYMBOL_GPL(power_supply_changed);
 
+/*
+ * Notify that power supply was registered after parent finished the probing.
+ *
+ * Often power supply is registered from driver's probe function. However
+ * calling power_supply_changed() directly from power_supply_register()
+ * would lead to execution of get_property() function provided by the driver
+ * too early - before the probe ends.
+ *
+ * Avoid that by waiting on parent's mutex.
+ */
+static void power_supply_deferred_register_work(struct work_struct *work)
+{
+        struct power_supply *psy = container_of(work, struct power_supply,
+                                                deferred_register_work.work);
+
+        if (psy->dev.parent)
+                mutex_lock(&psy->dev.parent->mutex);
+
+        power_supply_changed(psy);
+
+        if (psy->dev.parent)
+                mutex_unlock(&psy->dev.parent->mutex);
+}
+
 #ifdef CONFIG_OF
 #include <linux/of.h>
 
@@ -645,6 +671,10 @@ __power_supply_register(struct device *parent,
         struct power_supply *psy;
         int rc;
 
+        if (!parent)
+                pr_warn("%s: Expected proper parent device for '%s'\n",
+                        __func__, desc->name);
+
         psy = kzalloc(sizeof(*psy), GFP_KERNEL);
         if (!psy)
                 return ERR_PTR(-ENOMEM);
@@ -671,6 +701,8 @@ __power_supply_register(struct device *parent,
                 goto dev_set_name_failed;
 
         INIT_WORK(&psy->changed_work, power_supply_changed_work);
+        INIT_DELAYED_WORK(&psy->deferred_register_work,
+                          power_supply_deferred_register_work);
 
         rc = power_supply_check_supplies(psy);
         if (rc) {
@@ -709,7 +741,10 @@ __power_supply_register(struct device *parent,
          *    after calling power_supply_register()).
          */
         atomic_inc(&psy->use_cnt);
-        power_supply_changed(psy);
+
+        queue_delayed_work(system_power_efficient_wq,
+                           &psy->deferred_register_work,
+                           POWER_SUPPLY_DEFERRED_REGISTER_TIME);
 
         return psy;
 
@@ -729,7 +764,8 @@ dev_set_name_failed:
 
 /**
  * power_supply_register() - Register new power supply
- * @parent:     Device to be a parent of power supply's device
+ * @parent:     Device to be a parent of power supply's device, usually
+ *              the device which probe function calls this
  * @desc:       Description of power supply, must be valid through whole
  *              lifetime of this power supply
  * @cfg:        Run-time specific configuration accessed during registering,
@@ -750,7 +786,8 @@ EXPORT_SYMBOL_GPL(power_supply_register);
 
 /**
  * power_supply_register() - Register new non-waking-source power supply
- * @parent:     Device to be a parent of power supply's device
+ * @parent:     Device to be a parent of power supply's device, usually
+ *              the device which probe function calls this
  * @desc:       Description of power supply, must be valid through whole
  *              lifetime of this power supply
  * @cfg:        Run-time specific configuration accessed during registering,
@@ -779,7 +816,8 @@ static void devm_power_supply_release(struct device *dev, void *res)
 
 /**
  * power_supply_register() - Register managed power supply
- * @parent:     Device to be a parent of power supply's device
+ * @parent:     Device to be a parent of power supply's device, usually
+ *              the device which probe function calls this
  * @desc:       Description of power supply, must be valid through whole
  *              lifetime of this power supply
  * @cfg:        Run-time specific configuration accessed during registering,
@@ -814,7 +852,8 @@ EXPORT_SYMBOL_GPL(devm_power_supply_register);
 
 /**
  * power_supply_register() - Register managed non-waking-source power supply
- * @parent:     Device to be a parent of power supply's device
+ * @parent:     Device to be a parent of power supply's device, usually
+ *              the device which probe function calls this
  * @desc:       Description of power supply, must be valid through whole
  *              lifetime of this power supply
  * @cfg:        Run-time specific configuration accessed during registering,
@@ -858,6 +897,7 @@ void power_supply_unregister(struct power_supply *psy)
 {
         WARN_ON(atomic_dec_return(&psy->use_cnt));
         cancel_work_sync(&psy->changed_work);
+        cancel_delayed_work_sync(&psy->deferred_register_work);
         sysfs_remove_link(&psy->dev.kobj, "powers");
         power_supply_remove_triggers(psy);
         psy_unregister_cooler(psy);