pinctrl: add checks for empty function names

This is needed as otherwise we can get the following when
dealing with buggy data in a pinmux driver for
pinmux_search_function:

Unable to handle kernel NULL pointer dereference at virtual
address 00000000
...
PC is at strcmp+0xc/0x34
LR is at pinmux_get+0x350/0x8f4
...

As we need pctldev initialized to call ops->list_functions,
let's initialize it before check_ops calls and pass the
pctldev to the check_ops functions. Do this for both pinmux
and pinconf check_ops functions.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index d9d35fc..8fe15cf 100644 (file)
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -583,40 +583,40 @@ struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
        if (pctldesc->name == NULL)
                return NULL;
 
+       pctldev = kzalloc(sizeof(struct pinctrl_dev), GFP_KERNEL);
+       if (pctldev == NULL)
+               return NULL;
+
+       /* Initialize pin control device struct */
+       pctldev->owner = pctldesc->owner;
+       pctldev->desc = pctldesc;
+       pctldev->driver_data = driver_data;
+       INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
+       spin_lock_init(&pctldev->pin_desc_tree_lock);
+       INIT_LIST_HEAD(&pctldev->gpio_ranges);
+       mutex_init(&pctldev->gpio_ranges_lock);
+       pctldev->dev = dev;
+
        /* If we're implementing pinmuxing, check the ops for sanity */
        if (pctldesc->pmxops) {
-               ret = pinmux_check_ops(pctldesc->pmxops);
+               ret = pinmux_check_ops(pctldev);
                if (ret) {
                        pr_err("%s pinmux ops lacks necessary functions\n",
                               pctldesc->name);
-                       return NULL;
+                       goto out_err;
                }
        }
 
        /* If we're implementing pinconfig, check the ops for sanity */
        if (pctldesc->confops) {
-               ret = pinconf_check_ops(pctldesc->confops);
+               ret = pinconf_check_ops(pctldev);
                if (ret) {
                        pr_err("%s pin config ops lacks necessary functions\n",
                               pctldesc->name);
-                       return NULL;
+                       goto out_err;
                }
        }
 
-       pctldev = kzalloc(sizeof(struct pinctrl_dev), GFP_KERNEL);
-       if (pctldev == NULL)
-               return NULL;
-
-       /* Initialize pin control device struct */
-       pctldev->owner = pctldesc->owner;
-       pctldev->desc = pctldesc;
-       pctldev->driver_data = driver_data;
-       INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
-       spin_lock_init(&pctldev->pin_desc_tree_lock);
-       INIT_LIST_HEAD(&pctldev->gpio_ranges);
-       mutex_init(&pctldev->gpio_ranges_lock);
-       pctldev->dev = dev;
-
        /* Register all the pins */
        pr_debug("try to register %d pins on %s...\n",
                 pctldesc->npins, pctldesc->name);

diff --git a/drivers/pinctrl/pinconf.c b/drivers/pinctrl/pinconf.c
index 1892a37..9fb7545 100644 (file)
--- a/drivers/pinctrl/pinconf.c
+++ b/drivers/pinctrl/pinconf.c
@@ -205,8 +205,10 @@ int pin_config_group_set(const char *dev_name, const char *pin_group,
 }
 EXPORT_SYMBOL(pin_config_group_set);
 
-int pinconf_check_ops(const struct pinconf_ops *ops)
+int pinconf_check_ops(struct pinctrl_dev *pctldev)
 {
+       const struct pinconf_ops *ops = pctldev->desc->confops;
+
        /* We must be able to read out pin status */
        if (!ops->pin_config_get && !ops->pin_config_group_get)
                return -EINVAL;

diff --git a/drivers/pinctrl/pinconf.h b/drivers/pinctrl/pinconf.h
index e7dc616..006b77f 100644 (file)
--- a/drivers/pinctrl/pinconf.h
+++ b/drivers/pinctrl/pinconf.h
@@ -13,7 +13,7 @@
 
 #ifdef CONFIG_PINCONF
 
-int pinconf_check_ops(const struct pinconf_ops *ops);
+int pinconf_check_ops(struct pinctrl_dev *pctldev);
 void pinconf_init_device_debugfs(struct dentry *devroot,
                                 struct pinctrl_dev *pctldev);
 int pin_config_get_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
@@ -23,7 +23,7 @@ int pin_config_set_for_pin(struct pinctrl_dev *pctldev, unsigned pin,
 
 #else
 
-static inline int pinconf_check_ops(const struct pinconf_ops *ops)
+static inline int pinconf_check_ops(struct pinctrl_dev *pctldev)
 {
        return 0;
 }

diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 3ffa932..7c3193f 100644 (file)
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -889,8 +889,11 @@ void pinmux_disable(struct pinmux *pmx)
 }
 EXPORT_SYMBOL_GPL(pinmux_disable);
 
-int pinmux_check_ops(const struct pinmux_ops *ops)
+int pinmux_check_ops(struct pinctrl_dev *pctldev)
 {
+       const struct pinmux_ops *ops = pctldev->desc->pmxops;
+       unsigned selector = 0;
+
        /* Check that we implement required operations */
        if (!ops->list_functions ||
            !ops->get_function_name ||
@@ -899,6 +902,18 @@ int pinmux_check_ops(const struct pinmux_ops *ops)
            !ops->disable)
                return -EINVAL;
 
+       /* Check that all functions registered have names */
+       while (ops->list_functions(pctldev, selector) >= 0) {
+               const char *fname = ops->get_function_name(pctldev,
+                                                          selector);
+               if (!fname) {
+                       pr_err("pinmux ops has no name for function%u\n",
+                               selector);
+                       return -EINVAL;
+               }
+               selector++;
+       }
+
        return 0;
 }
 

diff --git a/drivers/pinctrl/pinmux.h b/drivers/pinctrl/pinmux.h
index 844500b..97f5222 100644 (file)
--- a/drivers/pinctrl/pinmux.h
+++ b/drivers/pinctrl/pinmux.h
@@ -12,7 +12,7 @@
  */
 #ifdef CONFIG_PINMUX
 
-int pinmux_check_ops(const struct pinmux_ops *ops);
+int pinmux_check_ops(struct pinctrl_dev *pctldev);
 void pinmux_init_device_debugfs(struct dentry *devroot,
                                struct pinctrl_dev *pctldev);
 void pinmux_init_debugfs(struct dentry *subsys_root);
@@ -21,7 +21,7 @@ void pinmux_unhog_maps(struct pinctrl_dev *pctldev);
 
 #else
 
-static inline int pinmux_check_ops(const struct pinmux_ops *ops)
+static inline int pinmux_check_ops(struct pinctrl_dev *pctldev)
 {
        return 0;
 }