diff options
| author | H Hartley Sweeten <hsweeten@visionengravers.com> | 2014-04-17 10:07:46 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-22 10:21:29 -0700 |
| commit | 860b7c398a744c1eef42a59b661e870aca12d9be (patch) | |
| tree | 3f6534fab742cd167791f29dfc0d5776b54b0b08 /drivers/staging/comedi/drivers/rtd520.c | |
| parent | 5089b058966c4f6a5ca33556ca8c3bc88be0ab4c (diff) | |
staging: comedi: drivers: core validates chanlist_len max
The comedi core checks if the (cmd->chanlist_len > s->len_chanlist) when the
comedi_cmd is copied from user to kernel space by __comedi_get_user_cmd().
If so, the core returns -EINVAL and will not call the subdevice (*do_cmdtest)
and (*do_cmd).
Remove the unnecessary "max" checks in the comedi driver (*do_cmdtest) and
helper functions.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/comedi/drivers/rtd520.c')
| -rw-r--r-- | drivers/staging/comedi/drivers/rtd520.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/drivers/staging/comedi/drivers/rtd520.c b/drivers/staging/comedi/drivers/rtd520.c index cd3fdf973bdd..1b1c166c8e9b 100644 --- a/drivers/staging/comedi/drivers/rtd520.c +++ b/drivers/staging/comedi/drivers/rtd520.c @@ -891,10 +891,6 @@ static int rtd_ai_cmdtest(struct comedi_device *dev, /* step 4: fix up any arguments */ - if (cmd->chanlist_len > RTD_MAX_CHANLIST) { - cmd->chanlist_len = RTD_MAX_CHANLIST; - err++; - } if (cmd->scan_begin_src == TRIG_TIMER) { tmp = cmd->scan_begin_arg; rtd_ns_to_timer(&cmd->scan_begin_arg, |