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comedi: aio_iiro_16: Add sanity check to interrupt handler

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The driver requests an interrupt handler for the device, after setting
device registers to disable interrupt generation.  The interrupt handler
should not be called prematurely unless the user-configured I/O port
base address and/or IRQ number are incorrect or the hardware is bad.

For safety, check the dev->attached flag in the interrupt handler to
ensure the device has been fully set up, avoiding a possible null
pointer dereference of dev->read_subdev.

Reported-by: Jaeyoung Chung <jjy600901@snu.ac.kr>
Link: https://lore.kernel.org/lkml/20260610115912.780131-1-jjy600901@snu.ac.kr/
Reported-by: Sangyun Kim <sangyun.kim@snu.ac.kr>
Reported-by: Kyungwook Boo <bookyungwook@gmail.com>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://patch.msgid.link/20260618102949.26607-2-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott
2026-06-18 11:09:08 +01:00
committed by Greg Kroah-Hartman
parent 71375da8b4
commit 1ca4475191
1 changed files with 3 additions and 0 deletions
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3
drivers/comedi/drivers/aio_iiro_16.c
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@@ -59,6 +59,9 @@ static irqreturn_t aio_iiro_16_cos(int irq, void *d)
unsigned int status;
unsigned int val;
if (!dev->attached)
return IRQ_NONE;
status = inb(dev->iobase + AIO_IIRO_16_STATUS);
if (!(status & AIO_IIRO_16_STATUS_IRQE))
return IRQ_NONE;