diff options
author | Tony Lindgren <tony@atomide.com> | 2012-01-25 00:28:08 (GMT) |
---|---|---|
committer | Linus Walleij <linus.walleij@linaro.org> | 2012-01-26 13:13:11 (GMT) |
commit | b9130b776ee481acbc27a7e56d98df75680de369 (patch) | |
tree | b7933b4d3e562e806c3dc61544352e46f35820cb /drivers | |
parent | 9e2551e10b5c7ba550849bd9ed519e498cc30e68 (diff) | |
download | linux-fsl-qoriq-b9130b776ee481acbc27a7e56d98df75680de369.tar.xz |
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>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/pinctrl/core.c | 36 | ||||
-rw-r--r-- | drivers/pinctrl/pinconf.c | 4 | ||||
-rw-r--r-- | drivers/pinctrl/pinconf.h | 4 | ||||
-rw-r--r-- | drivers/pinctrl/pinmux.c | 17 | ||||
-rw-r--r-- | drivers/pinctrl/pinmux.h | 4 |
5 files changed, 41 insertions, 24 deletions
diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index d9d35fc..8fe15cf 100644 --- 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 --- 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 --- 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 --- 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 --- 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; } |