staging: comedi: (regression) channel list must be set for COMEDI_CMD ioctl

`do_cmd_ioctl()`, the handler for the `COMEDI_CMD` ioctl can incorrectly
call the Comedi subdevice's `do_cmd()` handler with a NULL channel list
pointer.  This is a regression as the `do_cmd()` handler has never been
expected to deal with that, leading to a kernel OOPS when it tries to
dereference it.

A NULL channel list pointer is allowed for the `COMEDI_CMDTEST` ioctl,
handled by `do_cmdtest_ioctl()` and the subdevice's `do_cmdtest()`
handler, but not for the `COMEDI_CMD` ioctl and its handlers.

Both `do_cmd_ioctl()` and `do_cmdtest_ioctl()` call
`__comedi_get_user_chanlist()` to copy the channel list from user memory
into dynamically allocated kernel memory and check it for consistency.
That function currently returns 0 if the `user_chanlist` parameter
(pointing to the channel list in user memory) is NULL.  That's fine for
`do_cmdtest_ioctl()`, but `do_cmd_ioctl()` incorrectly assumes the
kernel copy of the channel list has been set-up correctly.

Fix it by not allowing the `user_chanlist` parameter to be NULL in
`__comedi_get_user_chanlist()`, and only calling it from
`do_cmdtest_ioctl()` if the parameter is non-NULL.

Thanks to Bernd Porr for reporting the bug via an initial patch sent
privately.

Fixes: c6cd0eefb27b ("staging: comedi: comedi_fops: introduce __comedi_get_user_chanlist()")
Reported-by: Bernd Porr <mail@berndporr.me.uk>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Bernd Porr <mail@berndporr.me.uk>
Cc: <stable@vger.kernel.org> # 3.15.y 3.16.y 3.17.y
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 8 deletions

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 495969f46e76..a9b7fe52d380 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -1462,10 +1462,6 @@ static int __comedi_get_user_chanlist(struct comedi_device *dev,
         unsigned int *chanlist;
         int ret;
 
-        /* user_chanlist could be NULL for do_cmdtest ioctls */
-        if (!user_chanlist)
-                return 0;
-
         chanlist = memdup_user(user_chanlist,
                                cmd->chanlist_len * sizeof(unsigned int));
         if (IS_ERR(chanlist))
@@ -1609,10 +1605,13 @@ static int do_cmdtest_ioctl(struct comedi_device *dev,
 
         s = &dev->subdevices[cmd.subdev];
 
-        /* load channel/gain list */
-        ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &cmd);
-        if (ret)
-                return ret;
+        /* user_chanlist can be NULL for COMEDI_CMDTEST ioctl */
+        if (user_chanlist) {
+                /* load channel/gain list */
+                ret = __comedi_get_user_chanlist(dev, s, user_chanlist, &cmd);
+                if (ret)
+                        return ret;
+        }
 
         ret = s->do_cmdtest(dev, s, &cmd);