[PATCH 0/4] staging: comedi: INSN_CONFIG_DIGITAL_TRIG fixes

[Ian Abbott <abbotti@mev.co.uk>]

These patches correct problems with INSN_CONFIG_DIGITAL_TRIG comedi
configuration instructions in various comedi drivers, in particular the
use of unconstrained bit shift amounts from userspace leading to
undefined behaviour (although hopefully not the kernel crashy sort).

The patches have been marked for inclusion in the stable tree.  Note
that patch 4 changes a similar area of code to Dan Carpenter's commit
ef75e14a6c93 ("staging: comedi: verify array index is correct before
using it"), so I have indicated it as a prerequisite.

*Note to Greg KH*: I have based these patches on your "staging-linus"
branch due to the prerequisite ef75e14a6c93 mentioned above being
present in neither "staging-next" nor "staging-testing" at the time of
posting.

1) staging: comedi: ni_6527: fix INSN_CONFIG_DIGITAL_TRIG support
2) staging: comedi: addi_apci_1032: check INSN_CONFIG_DIGITAL_TRIG shift
3) staging: comedi: addi_apci_1564: check INSN_CONFIG_DIGITAL_TRIG shift
4) staging: comedi: addi_apci_1500: check INSN_CONFIG_DIGITAL_TRIG shift

 drivers/staging/comedi/drivers/addi_apci_1032.c | 20 ++++++++++++++------
 drivers/staging/comedi/drivers/addi_apci_1500.c | 24 +++++++++++++++++++-----
 drivers/staging/comedi/drivers/addi_apci_1564.c | 20 ++++++++++++++------
 drivers/staging/comedi/drivers/ni_6527.c        |  2 +-
 4 files changed, 48 insertions(+), 18 deletions(-)