The `INSN_CONFIG` comedi instruction with sub-instruction code
`INSN_CONFIG_DIGITAL_TRIG` includes a base channel in `data[3]`. This is
used as a right shift amount for other bitmask values without being
checked. Shift amounts greater than or equal to 32 will result in
undefined behavior. Add code to deal with this.
Fixes: 33cdce6293dcc ("staging: comedi: addi_apci_1032: conform to new
INSN_CONFIG_DIGITAL_TRIG"
Cc: <sta...@vger.kernel.org> #3.8+
Signed-off-by: Ian Abbott <abbo...@mev.co.uk>
---
.../staging/comedi/drivers/addi_apci_1032.c | 20 +++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)
diff --git a/drivers/staging/comedi/drivers/addi_apci_1032.c
b/drivers/staging/comedi/drivers/addi_apci_1032.c
index 560649be9d13..e035c9f757a1 100644
--- a/drivers/staging/comedi/drivers/addi_apci_1032.c
+++ b/drivers/staging/comedi/drivers/addi_apci_1032.c
@@ -106,14 +106,22 @@ static int apci1032_cos_insn_config(struct comedi_device
*dev,
unsigned int *data)
{
struct apci1032_private *devpriv = dev->private;
- unsigned int shift, oldmask;
+ unsigned int shift, oldmask, himask, lomask;
switch (data[0]) {
case INSN_CONFIG_DIGITAL_TRIG:
if (data[1] != 0)
return -EINVAL;
shift = data[3];
- oldmask = (1U << shift) - 1;
+ if (shift < 32) {
+ oldmask = (1U << shift) - 1;
+ himask = data[4] << shift;
+ lomask = data[5] << shift;
+ } else {
+ oldmask = 0xffffffffu;
+ himask = 0;
+ lomask = 0;
+ }
switch (data[2]) {
case COMEDI_DIGITAL_TRIG_DISABLE:
devpriv->ctrl = 0;
@@ -136,8 +144,8 @@ static int apci1032_cos_insn_config(struct comedi_device
*dev,
devpriv->mode2 &= oldmask;
}
/* configure specified channels */
- devpriv->mode1 |= data[4] << shift;
- devpriv->mode2 |= data[5] << shift;
+ devpriv->mode1 |= himask;
+ devpriv->mode2 |= lomask;
break;
case COMEDI_DIGITAL_TRIG_ENABLE_LEVELS:
if (devpriv->ctrl != (APCI1032_CTRL_INT_ENA |
@@ -154,8 +162,8 @@ static int apci1032_cos_insn_config(struct comedi_device
*dev,
devpriv->mode2 &= oldmask;
}
/* configure specified channels */
- devpriv->mode1 |= data[4] << shift;
- devpriv->mode2 |= data[5] << shift;
+ devpriv->mode1 |= himask;
+ devpriv->mode2 |= lomask;
break;
default:
return -EINVAL;
--
2.27.0
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