From 00035beeec2c067a8094d3d86b34cc797c3d6b21 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sun, 26 Apr 2020 08:46:04 -0400 Subject: [PATCH] comedi: lift copy_from_user() into callers of __comedi_get_user_cmd() Signed-off-by: Al Viro --- drivers/staging/comedi/comedi_fops.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c index 10ab24019fa5..c136cb2f676a 100644 --- a/drivers/staging/comedi/comedi_fops.c +++ b/drivers/staging/comedi/comedi_fops.c @@ -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;