staging: comedi: kcomedilib: fix a __user space access issue

The 'data' field in struct comedi_insn is an unsigned int __user *.
The comedi core copies this data to kernel space before passing it
on to a drivers insn_bits/insn_config method.

kcomedilib provides an interface for external kernel modules to
use the comedi drivers. This interface creates a comedi_insn
that is then passed to the comedi drivers insn_bits/insn_config
method. Unfortunately, kcomedilib is using the comedi_insn 'data'
field directly which results in some sparse warnings:

  warning: incorrect type in argument 4 (different address spaces)
     expected unsigned int *<noident>
     got unsigned int [noderef] <asn:1>*data

  warning: incorrect type in assignment (different address spaces)
     expected unsigned int [noderef] <asn:1>*[addressable] [assigned] data
     got unsigned int *<noident>

Fix this by passing the kernel data directly, as a separate parameter,
instead of trying to put in into the comedi_insn 'data' field. This is
how the comedi core handles the data from user space.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 7 deletions

diff --git a/drivers/staging/comedi/kcomedilib/kcomedilib_main.c b/drivers/staging/comedi/kcomedilib/kcomedilib_main.c
index f96416d1d2f7..3f20ea55b8d0 100644
--- a/drivers/staging/comedi/kcomedilib/kcomedilib_main.c
+++ b/drivers/staging/comedi/kcomedilib/kcomedilib_main.c
@@ -80,7 +80,9 @@ int comedi_close(struct comedi_device *d)
 }
 EXPORT_SYMBOL(comedi_close);
 
-static int comedi_do_insn(struct comedi_device *dev, struct comedi_insn *insn)
+static int comedi_do_insn(struct comedi_device *dev,
+                          struct comedi_insn *insn,
+                          unsigned int *data)
 {
         struct comedi_subdevice *s;
         int ret = 0;
@@ -115,11 +117,11 @@ static int comedi_do_insn(struct comedi_device *dev, struct comedi_insn *insn)
 
         switch (insn->insn) {
         case INSN_BITS:
-                ret = s->insn_bits(dev, s, insn, insn->data);
+                ret = s->insn_bits(dev, s, insn, data);
                 break;
         case INSN_CONFIG:
                 /* XXX should check instruction length */
-                ret = s->insn_config(dev, s, insn, insn->data);
+                ret = s->insn_config(dev, s, insn, data);
                 break;
         default:
                 ret = -EINVAL;
@@ -140,11 +142,10 @@ int comedi_dio_config(struct comedi_device *dev, unsigned int subdev,
         memset(&insn, 0, sizeof(insn));
         insn.insn = INSN_CONFIG;
         insn.n = 1;
-        insn.data = &io;
         insn.subdev = subdev;
         insn.chanspec = CR_PACK(chan, 0, 0);
 
-        return comedi_do_insn(dev, &insn);
+        return comedi_do_insn(dev, &insn, &io);
 }
 EXPORT_SYMBOL(comedi_dio_config);
 
@@ -158,13 +159,12 @@ int comedi_dio_bitfield(struct comedi_device *dev, unsigned int subdev,
         memset(&insn, 0, sizeof(insn));
         insn.insn = INSN_BITS;
         insn.n = 2;
-        insn.data = data;
         insn.subdev = subdev;
 
         data[0] = mask;
         data[1] = *bits;
 
-        ret = comedi_do_insn(dev, &insn);
+        ret = comedi_do_insn(dev, &insn, data);
 
         *bits = data[1];