staging: comedi: drivers: core validates chanlist_len max
authorH Hartley Sweeten <hsweeten@visionengravers.com>
Thu, 17 Apr 2014 17:07:46 +0000 (10:07 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 22 Apr 2014 17:21:29 +0000 (10:21 -0700)
commit860b7c398a744c1eef42a59b661e870aca12d9be
tree3f6534fab742cd167791f29dfc0d5776b54b0b08
parent5089b058966c4f6a5ca33556ca8c3bc88be0ab4c
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>
drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c
drivers/staging/comedi/drivers/adl_pci9118.c
drivers/staging/comedi/drivers/pcl812.c
drivers/staging/comedi/drivers/rtd520.c