From: Ian Abbott <abbotti@mev.co.uk>
To: devel@driverdev.osuosl.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Ian Abbott <abbotti@mev.co.uk>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH 3/4] staging: comedi: addi_apci_1564: check INSN_CONFIG_DIGITAL_TRIG shift
Date: Fri, 17 Jul 2020 15:52:56 +0100 [thread overview]
Message-ID: <20200717145257.112660-4-abbotti@mev.co.uk> (raw)
In-Reply-To: <20200717145257.112660-1-abbotti@mev.co.uk>
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: 1e15687ea472 ("staging: comedi: addi_apci_1564: add Change-of-State interrupt subdevice and required functions"
Cc: <stable@vger.kernel.org> #3.17+
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
---
.../staging/comedi/drivers/addi_apci_1564.c | 20 +++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)
diff --git a/drivers/staging/comedi/drivers/addi_apci_1564.c b/drivers/staging/comedi/drivers/addi_apci_1564.c
index 10501fe6bb25..1268ba34be5f 100644
--- a/drivers/staging/comedi/drivers/addi_apci_1564.c
+++ b/drivers/staging/comedi/drivers/addi_apci_1564.c
@@ -331,14 +331,22 @@ static int apci1564_cos_insn_config(struct comedi_device *dev,
unsigned int *data)
{
struct apci1564_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;
@@ -362,8 +370,8 @@ static int apci1564_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 != (APCI1564_DI_IRQ_ENA |
@@ -380,8 +388,8 @@ static int apci1564_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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next prev parent reply other threads:[~2020-07-17 14:53 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-17 14:52 [PATCH 0/4] staging: comedi: INSN_CONFIG_DIGITAL_TRIG fixes Ian Abbott
2020-07-17 14:52 ` [PATCH 1/4] staging: comedi: ni_6527: fix INSN_CONFIG_DIGITAL_TRIG support Ian Abbott
2020-07-17 14:52 ` [PATCH 2/4] staging: comedi: addi_apci_1032: check INSN_CONFIG_DIGITAL_TRIG shift Ian Abbott
2020-07-17 14:52 ` Ian Abbott [this message]
2020-07-17 14:52 ` [PATCH 4/4] staging: comedi: addi_apci_1500: " Ian Abbott
2020-07-20 8:19 ` [PATCH 0/4] staging: comedi: INSN_CONFIG_DIGITAL_TRIG fixes Greg Kroah-Hartman
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