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gpio: handle compatible ioctl() pointers

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If we're using the compatible ioctl() we need to handle the
argument pointer in a special way or there will be trouble.

Fixes: 3c702e9987 ("gpio: add a userspace chardev ABI for GPIOs")
Reported-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2016-05-27 14:24:04 +02:00
parent 9c10280d85
commit 8b92e17efe
1 changed files with 13 additions and 2 deletions
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15
drivers/gpio/gpiolib.c
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@ -20,6 +20,7 @@
#include <linux/cdev.h> #include <linux/cdev.h>
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/uaccess.h> #include <linux/uaccess.h>
#include <linux/compat.h>
#include <uapi/linux/gpio.h> #include <uapi/linux/gpio.h>
#include "gpiolib.h" #include "gpiolib.h"
@ -316,7 +317,7 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{ {
struct gpio_device *gdev = filp->private_data; struct gpio_device *gdev = filp->private_data;
struct gpio_chip *chip = gdev->chip; struct gpio_chip *chip = gdev->chip;
int __user *ip = (int __user *)arg; void __user *ip = (void __user *)arg;
/* We fail any subsequent ioctl():s when the chip is gone */ /* We fail any subsequent ioctl():s when the chip is gone */
if (!chip) if (!chip)
@ -388,6 +389,14 @@ static long gpio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return -EINVAL; return -EINVAL;
} }
#ifdef CONFIG_COMPAT
static long gpio_ioctl_compat(struct file *filp, unsigned int cmd,
unsigned long arg)
{
return gpio_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
}
#endif
/** /**
* gpio_chrdev_open() - open the chardev for ioctl operations * gpio_chrdev_open() - open the chardev for ioctl operations
* @inode: inode for this chardev * @inode: inode for this chardev
@ -431,7 +440,9 @@ static const struct file_operations gpio_fileops = {
.owner = THIS_MODULE, .owner = THIS_MODULE,
.llseek = noop_llseek, .llseek = noop_llseek,
.unlocked_ioctl = gpio_ioctl, .unlocked_ioctl = gpio_ioctl,
.compat_ioctl = gpio_ioctl, #ifdef CONFIG_COMPAT
.compat_ioctl = gpio_ioctl_compat,
#endif
}; };
static void gpiodevice_release(struct device *dev) static void gpiodevice_release(struct device *dev)