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comedi: lift copy_from_user() into callers of __comedi_get_user_cmd()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-04-26 08:46:04 -04:00
parent b8d47d8813
commit 00035beeec
1 changed files with 12 additions and 8 deletions
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20
drivers/staging/comedi/comedi_fops.c
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@ -1649,17 +1649,11 @@ static int do_insn_ioctl(struct comedi_device *dev,
}
static int __comedi_get_user_cmd(struct comedi_device *dev,
struct comedi_cmd __user *arg,
struct comedi_cmd *cmd)
{
struct comedi_subdevice *s;
lockdep_assert_held(&dev->mutex);
if (copy_from_user(cmd, arg, sizeof(*cmd))) {
dev_dbg(dev->class_dev, "bad cmd address\n");
return -EFAULT;
}
if (cmd->subdev >= dev->n_subdevices) {
dev_dbg(dev->class_dev, "%d no such subdevice\n", cmd->subdev);
return -ENODEV;
@ -1757,8 +1751,13 @@ static int do_cmd_ioctl(struct comedi_device *dev,
lockdep_assert_held(&dev->mutex);
if (copy_from_user(&cmd, arg, sizeof(cmd))) {
dev_dbg(dev->class_dev, "bad cmd address\n");
return -EFAULT;
}
/* get the user's cmd and do some simple validation */
ret = __comedi_get_user_cmd(dev, arg, &cmd);
ret = __comedi_get_user_cmd(dev, &cmd);
if (ret)
return ret;
@ -1866,8 +1865,13 @@ static int do_cmdtest_ioctl(struct comedi_device *dev,
lockdep_assert_held(&dev->mutex);
if (copy_from_user(&cmd, arg, sizeof(cmd))) {
dev_dbg(dev->class_dev, "bad cmd address\n");
return -EFAULT;
}
/* get the user's cmd and do some simple validation */
ret = __comedi_get_user_cmd(dev, arg, &cmd);
ret = __comedi_get_user_cmd(dev, &cmd);
if (ret)
return ret;