* [PATCH 5.10.y] comedi: das6402: Fix bit shift out of bounds
2025-07-24 18:12 [PATCH 5.10.y] comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large Ian Abbott
@ 2025-07-24 18:12 ` Ian Abbott
2025-07-25 23:24 ` Sasha Levin
0 siblings, 1 reply; 4+ messages in thread
From: Ian Abbott @ 2025-07-24 18:12 UTC (permalink / raw)
To: stable; +Cc: Ian Abbott, Greg Kroah-Hartman
[ Upstream commit 70f2b28b5243df557f51c054c20058ae207baaac ]
When checking for a supported IRQ number, the following test is used:
/* IRQs 2,3,5,6,7, 10,11,15 are valid for "enhanced" mode */
if ((1 << it->options[1]) & 0x8cec) {
However, `it->options[i]` is an unchecked `int` value from userspace, so
the shift amount could be negative or out of bounds. Fix the test by
requiring `it->options[1]` to be within bounds before proceeding with
the original test. Valid `it->options[1]` values that select the IRQ
will be in the range [1,15]. The value 0 explicitly disables the use of
interrupts.
Fixes: 79e5e6addbb1 ("staging: comedi: das6402: rewrite broken driver")
Cc: stable@vger.kernel.org # 5.13+
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20250707135737.77448-1-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/staging/comedi/drivers/das6402.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/comedi/drivers/das6402.c b/drivers/staging/comedi/drivers/das6402.c
index 96f4107b8054..927d4b832ecc 100644
--- a/drivers/staging/comedi/drivers/das6402.c
+++ b/drivers/staging/comedi/drivers/das6402.c
@@ -569,7 +569,8 @@ static int das6402_attach(struct comedi_device *dev,
das6402_reset(dev);
/* IRQs 2,3,5,6,7, 10,11,15 are valid for "enhanced" mode */
- if ((1 << it->options[1]) & 0x8cec) {
+ if (it->options[1] > 0 && it->options[1] < 16 &&
+ (1 << it->options[1]) & 0x8cec) {
ret = request_irq(it->options[1], das6402_interrupt, 0,
dev->board_name, dev);
if (ret == 0) {
--
2.47.2
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH 5.10.y] comedi: das6402: Fix bit shift out of bounds
@ 2025-07-24 18:16 Ian Abbott
2025-07-25 23:26 ` Sasha Levin
0 siblings, 1 reply; 4+ messages in thread
From: Ian Abbott @ 2025-07-24 18:16 UTC (permalink / raw)
To: stable; +Cc: Ian Abbott, Greg Kroah-Hartman
[ Upstream commit 70f2b28b5243df557f51c054c20058ae207baaac ]
When checking for a supported IRQ number, the following test is used:
/* IRQs 2,3,5,6,7, 10,11,15 are valid for "enhanced" mode */
if ((1 << it->options[1]) & 0x8cec) {
However, `it->options[i]` is an unchecked `int` value from userspace, so
the shift amount could be negative or out of bounds. Fix the test by
requiring `it->options[1]` to be within bounds before proceeding with
the original test. Valid `it->options[1]` values that select the IRQ
will be in the range [1,15]. The value 0 explicitly disables the use of
interrupts.
Fixes: 79e5e6addbb1 ("staging: comedi: das6402: rewrite broken driver")
Cc: stable@vger.kernel.org # 5.13+
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20250707135737.77448-1-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/staging/comedi/drivers/das6402.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/comedi/drivers/das6402.c b/drivers/staging/comedi/drivers/das6402.c
index 96f4107b8054..927d4b832ecc 100644
--- a/drivers/staging/comedi/drivers/das6402.c
+++ b/drivers/staging/comedi/drivers/das6402.c
@@ -569,7 +569,8 @@ static int das6402_attach(struct comedi_device *dev,
das6402_reset(dev);
/* IRQs 2,3,5,6,7, 10,11,15 are valid for "enhanced" mode */
- if ((1 << it->options[1]) & 0x8cec) {
+ if (it->options[1] > 0 && it->options[1] < 16 &&
+ (1 << it->options[1]) & 0x8cec) {
ret = request_irq(it->options[1], das6402_interrupt, 0,
dev->board_name, dev);
if (ret == 0) {
--
2.47.2
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH 5.10.y] comedi: das6402: Fix bit shift out of bounds
2025-07-24 18:12 ` [PATCH 5.10.y] comedi: das6402: Fix bit shift out of bounds Ian Abbott
@ 2025-07-25 23:24 ` Sasha Levin
0 siblings, 0 replies; 4+ messages in thread
From: Sasha Levin @ 2025-07-25 23:24 UTC (permalink / raw)
To: stable; +Cc: Sasha Levin
[ Sasha's backport helper bot ]
Hi,
✅ All tests passed successfully. No issues detected.
No action required from the submitter.
The upstream commit SHA1 provided is correct: 70f2b28b5243df557f51c054c20058ae207baaac
Status in newer kernel trees:
6.15.y | Not found
6.12.y | Not found
6.6.y | Not found
6.1.y | Not found
5.15.y | Not found
Note: The patch differs from the upstream commit:
---
1: 70f2b28b5243 ! 1: dee1eb300666 comedi: das6402: Fix bit shift out of bounds
@@ Metadata
## Commit message ##
comedi: das6402: Fix bit shift out of bounds
+ [ Upstream commit 70f2b28b5243df557f51c054c20058ae207baaac ]
+
When checking for a supported IRQ number, the following test is used:
/* IRQs 2,3,5,6,7, 10,11,15 are valid for "enhanced" mode */
@@ Commit message
Link: https://lore.kernel.org/r/20250707135737.77448-1-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
- ## drivers/comedi/drivers/das6402.c ##
-@@ drivers/comedi/drivers/das6402.c: static int das6402_attach(struct comedi_device *dev,
+ ## drivers/staging/comedi/drivers/das6402.c ##
+@@ drivers/staging/comedi/drivers/das6402.c: static int das6402_attach(struct comedi_device *dev,
das6402_reset(dev);
/* IRQs 2,3,5,6,7, 10,11,15 are valid for "enhanced" mode */
---
Results of testing on various branches:
| Branch | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| origin/linux-5.10.y | Success | Success |
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH 5.10.y] comedi: das6402: Fix bit shift out of bounds
2025-07-24 18:16 [PATCH 5.10.y] comedi: das6402: Fix bit shift out of bounds Ian Abbott
@ 2025-07-25 23:26 ` Sasha Levin
0 siblings, 0 replies; 4+ messages in thread
From: Sasha Levin @ 2025-07-25 23:26 UTC (permalink / raw)
To: stable; +Cc: Sasha Levin
[ Sasha's backport helper bot ]
Hi,
✅ All tests passed successfully. No issues detected.
No action required from the submitter.
The upstream commit SHA1 provided is correct: 70f2b28b5243df557f51c054c20058ae207baaac
Status in newer kernel trees:
6.15.y | Not found
6.12.y | Not found
6.6.y | Not found
6.1.y | Not found
5.15.y | Not found
Note: The patch differs from the upstream commit:
---
1: 70f2b28b5243 ! 1: 471728920391 comedi: das6402: Fix bit shift out of bounds
@@ Metadata
## Commit message ##
comedi: das6402: Fix bit shift out of bounds
+ [ Upstream commit 70f2b28b5243df557f51c054c20058ae207baaac ]
+
When checking for a supported IRQ number, the following test is used:
/* IRQs 2,3,5,6,7, 10,11,15 are valid for "enhanced" mode */
@@ Commit message
Link: https://lore.kernel.org/r/20250707135737.77448-1-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
- ## drivers/comedi/drivers/das6402.c ##
-@@ drivers/comedi/drivers/das6402.c: static int das6402_attach(struct comedi_device *dev,
+ ## drivers/staging/comedi/drivers/das6402.c ##
+@@ drivers/staging/comedi/drivers/das6402.c: static int das6402_attach(struct comedi_device *dev,
das6402_reset(dev);
/* IRQs 2,3,5,6,7, 10,11,15 are valid for "enhanced" mode */
---
Results of testing on various branches:
| Branch | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| origin/linux-5.10.y | Success | Success |
^ permalink raw reply [flat|nested] 4+ messages in thread
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2025-07-24 18:12 ` [PATCH 5.10.y] comedi: das6402: Fix bit shift out of bounds Ian Abbott
2025-07-25 23:24 ` Sasha Levin
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