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spidev: quit messing with access_ok()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-04-20 15:47:34 -04:00
parent 2ea659a9ef
commit 251d59515f
1 changed files with 11 additions and 31 deletions
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42
drivers/spi/spidev.c
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@ -254,10 +254,6 @@ static int spidev_message(struct spidev_data *spidev,
goto done;
}
k_tmp->rx_buf = rx_buf;
if (!access_ok(VERIFY_WRITE, (u8 __user *)
(uintptr_t) u_tmp->rx_buf,
u_tmp->len))
goto done;
rx_buf += k_tmp->len;
}
if (u_tmp->tx_buf) {
@ -305,7 +301,7 @@ static int spidev_message(struct spidev_data *spidev,
rx_buf = spidev->rx_buffer;
for (n = n_xfers, u_tmp = u_xfers; n; n--, u_tmp++) {
if (u_tmp->rx_buf) {
if (__copy_to_user((u8 __user *)
if (copy_to_user((u8 __user *)
(uintptr_t) u_tmp->rx_buf, rx_buf,
u_tmp->len)) {
status = -EFAULT;
@ -355,7 +351,6 @@ spidev_get_ioc_message(unsigned int cmd, struct spi_ioc_transfer __user *u_ioc,
static long
spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
int err = 0;
int retval = 0;
struct spidev_data *spidev;
struct spi_device *spi;
@ -367,19 +362,6 @@ spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
if (_IOC_TYPE(cmd) != SPI_IOC_MAGIC)
return -ENOTTY;
/* Check access direction once here; don't repeat below.
* IOC_DIR is from the user perspective, while access_ok is
* from the kernel perspective; so they look reversed.
*/
if (_IOC_DIR(cmd) & _IOC_READ)
err = !access_ok(VERIFY_WRITE,
(void __user *)arg, _IOC_SIZE(cmd));
if (err == 0 && _IOC_DIR(cmd) & _IOC_WRITE)
err = !access_ok(VERIFY_READ,
(void __user *)arg, _IOC_SIZE(cmd));
if (err)
return -EFAULT;
/* guard against device removal before, or while,
* we issue this ioctl.
*/
@ -402,31 +384,31 @@ spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
switch (cmd) {
/* read requests */
case SPI_IOC_RD_MODE:
retval = __put_user(spi->mode & SPI_MODE_MASK,
retval = put_user(spi->mode & SPI_MODE_MASK,
(__u8 __user *)arg);
break;
case SPI_IOC_RD_MODE32:
retval = __put_user(spi->mode & SPI_MODE_MASK,
retval = put_user(spi->mode & SPI_MODE_MASK,
(__u32 __user *)arg);
break;
case SPI_IOC_RD_LSB_FIRST:
retval = __put_user((spi->mode & SPI_LSB_FIRST) ? 1 : 0,
retval = put_user((spi->mode & SPI_LSB_FIRST) ? 1 : 0,
(__u8 __user *)arg);
break;
case SPI_IOC_RD_BITS_PER_WORD:
retval = __put_user(spi->bits_per_word, (__u8 __user *)arg);
retval = put_user(spi->bits_per_word, (__u8 __user *)arg);
break;
case SPI_IOC_RD_MAX_SPEED_HZ:
retval = __put_user(spidev->speed_hz, (__u32 __user *)arg);
retval = put_user(spidev->speed_hz, (__u32 __user *)arg);
break;
/* write requests */
case SPI_IOC_WR_MODE:
case SPI_IOC_WR_MODE32:
if (cmd == SPI_IOC_WR_MODE)
retval = __get_user(tmp, (u8 __user *)arg);
retval = get_user(tmp, (u8 __user *)arg);
else
retval = __get_user(tmp, (u32 __user *)arg);
retval = get_user(tmp, (u32 __user *)arg);
if (retval == 0) {
u32 save = spi->mode;
@ -445,7 +427,7 @@ spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
}
break;
case SPI_IOC_WR_LSB_FIRST:
retval = __get_user(tmp, (__u8 __user *)arg);
retval = get_user(tmp, (__u8 __user *)arg);
if (retval == 0) {
u32 save = spi->mode;
@ -462,7 +444,7 @@ spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
}
break;
case SPI_IOC_WR_BITS_PER_WORD:
retval = __get_user(tmp, (__u8 __user *)arg);
retval = get_user(tmp, (__u8 __user *)arg);
if (retval == 0) {
u8 save = spi->bits_per_word;
@ -475,7 +457,7 @@ spidev_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
}
break;
case SPI_IOC_WR_MAX_SPEED_HZ:
retval = __get_user(tmp, (__u32 __user *)arg);
retval = get_user(tmp, (__u32 __user *)arg);
if (retval == 0) {
u32 save = spi->max_speed_hz;
@ -525,8 +507,6 @@ spidev_compat_ioc_message(struct file *filp, unsigned int cmd,
struct spi_ioc_transfer *ioc;
u_ioc = (struct spi_ioc_transfer __user *) compat_ptr(arg);
if (!access_ok(VERIFY_READ, u_ioc, _IOC_SIZE(cmd)))
return -EFAULT;
/* guard against device removal before, or while,
* we issue this ioctl.