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comedi: ni_atmio16d: validate the IRQ supplied by userspace

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comedi boards are configured through the COMEDI_DEVCONFIG ioctl, so
it->options[1] is a number chosen by userspace. ni_atmio16d passes it to
request_irq() without checking it first, which lets an interrupt owned by
another irqdomain -- a PCI device's IO-APIC GSI, for instance -- be
claimed for this board. When the owner of that interrupt is later
released the descriptor is freed while this driver's handler is still
installed on it.

The driver already documents which interrupts the board can assert --
"0 == no irq; or 3,4,5,6,7,9,10,11,12,14,15" -- so use exactly that set
rather than the whole ISA range.

Bound the value before requesting it, as das16m1.c already does. An
out-of-range value is ignored rather than rejected, so the board still
attaches without interrupt support, exactly as it does today when
request_irq() fails.

Fixes: 2323b27630 ("Staging: comedi: add ni_at_atmio16d driver")
Assisted-by: LLM
Signed-off-by: Yogesh Gaur <yogeshgaur.83@gmail.com>
Link: https://patch.msgid.link/20260909104848.1763-3-yogeshgaur.83@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yogesh Gaur 2026-09-09 16:18:43 +05:30 committed by Greg Kroah-Hartman
parent 790ea68445
commit 71424db0eb
1 changed files with 3 additions and 1 deletions
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4
drivers/comedi/drivers/ni_atmio16d.c
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@ -593,7 +593,9 @@ static int atmio16d_attach(struct comedi_device *dev,
/* reset the atmio16d hardware */
reset_atmio16d(dev);
if (it->options[1]) {
/* only irqs 3, 4, 5, 6, 7, 9, 10, 11, 12, 14, and 15 are valid */
if (it->options[1] >= 3 && it->options[1] <= 15 &&
(1 << it->options[1]) & 0xdef8) {
ret = request_irq(it->options[1], atmio16d_interrupt, 0,
dev->board_name, dev);
if (ret == 0)