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comedi: do_cmd_ioctl(): lift copyin/copyout into the caller
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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parent
f0e4de5cd0
commit
0a3ccc75a9
1 changed files with 24 additions and 24 deletions
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@ -1741,9 +1741,8 @@ static int __comedi_get_user_chanlist(struct comedi_device *dev,
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* possibly modified comedi_cmd structure (when -EAGAIN returned)
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*/
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static int do_cmd_ioctl(struct comedi_device *dev,
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struct comedi_cmd __user *arg, void *file)
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struct comedi_cmd *cmd, bool *copy, void *file)
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{
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struct comedi_cmd cmd;
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struct comedi_subdevice *s;
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struct comedi_async *async;
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unsigned int __user *user_chanlist;
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@ -1751,20 +1750,15 @@ static int do_cmd_ioctl(struct comedi_device *dev,
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lockdep_assert_held(&dev->mutex);
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if (copy_from_user(&cmd, arg, sizeof(cmd))) {
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dev_dbg(dev->class_dev, "bad cmd address\n");
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return -EFAULT;
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}
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/* get the user's cmd and do some simple validation */
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ret = __comedi_get_user_cmd(dev, &cmd);
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/* do some simple cmd validation */
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ret = __comedi_get_user_cmd(dev, cmd);
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if (ret)
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return ret;
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/* save user's chanlist pointer so it can be restored later */
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user_chanlist = (unsigned int __user *)cmd.chanlist;
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user_chanlist = (unsigned int __user *)cmd->chanlist;
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s = &dev->subdevices[cmd.subdev];
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s = &dev->subdevices[cmd->subdev];
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async = s->async;
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/* are we locked? (ioctl lock) */
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@ -1780,13 +1774,13 @@ static int do_cmd_ioctl(struct comedi_device *dev,
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}
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/* make sure channel/gain list isn't too short */
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if (cmd.chanlist_len < 1) {
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if (cmd->chanlist_len < 1) {
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dev_dbg(dev->class_dev, "channel/gain list too short %u < 1\n",
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cmd.chanlist_len);
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cmd->chanlist_len);
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return -EINVAL;
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}
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async->cmd = cmd;
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async->cmd = *cmd;
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async->cmd.data = NULL;
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/* load channel/gain list */
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@ -1798,15 +1792,11 @@ static int do_cmd_ioctl(struct comedi_device *dev,
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if (async->cmd.flags & CMDF_BOGUS || ret) {
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dev_dbg(dev->class_dev, "test returned %d\n", ret);
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cmd = async->cmd;
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*cmd = async->cmd;
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/* restore chanlist pointer before copying back */
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cmd.chanlist = (unsigned int __force *)user_chanlist;
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cmd.data = NULL;
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if (copy_to_user(arg, &cmd, sizeof(cmd))) {
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dev_dbg(dev->class_dev, "fault writing cmd\n");
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ret = -EFAULT;
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goto cleanup;
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}
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cmd->chanlist = (unsigned int __force *)user_chanlist;
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cmd->data = NULL;
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*copy = true;
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ret = -EAGAIN;
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goto cleanup;
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}
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@ -2207,9 +2197,19 @@ static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
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case COMEDI_CANCEL:
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rc = do_cancel_ioctl(dev, arg, file);
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break;
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case COMEDI_CMD:
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rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
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case COMEDI_CMD: {
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struct comedi_cmd cmd;
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bool copy = false;
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if (copy_from_user(&cmd, (void __user *)arg, sizeof(cmd))) {
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rc = -EFAULT;
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break;
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}
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rc = do_cmd_ioctl(dev, &cmd, ©, file);
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if (copy && copy_to_user((void __user *)arg, &cmd, sizeof(cmd)))
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rc = -EFAULT;
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break;
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}
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case COMEDI_CMDTEST: {
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struct comedi_cmd cmd;
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bool copy = false;
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