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comedi: quatech_daqp_cs: Fix sanity check in interrupt handler

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The driver requests an interrupt handler for the device before it is
fully set up.

For safety, the interrupt handler checks the dev->attached flag to
ensure the device is fully set up, but it currently does that after
dereferencing the dev->read_dev pointer which may be NULL if
dev->attached is false.  Move the check to avoid the possible null
pointer dereference.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Link: https://patch.msgid.link/20260618102949.26607-12-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott
2026-06-18 11:09:18 +01:00
committed by Greg Kroah-Hartman
parent 6f6f6644e0
commit 1bc9538df6
1 changed files with 3 additions and 1 deletions
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4
drivers/comedi/drivers/quatech_daqp_cs.c
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@@ -211,13 +211,15 @@ static irqreturn_t daqp_interrupt(int irq, void *dev_id)
{
struct comedi_device *dev = dev_id;
struct comedi_subdevice *s = dev->read_subdev;
struct comedi_cmd *cmd = &s->async->cmd;
struct comedi_cmd *cmd;
int loop_limit = 10000;
int status;
if (!dev->attached)
return IRQ_NONE;
cmd = &s->async->cmd;
status = inb(dev->iobase + DAQP_STATUS_REG);
if (!(status & DAQP_STATUS_EVENTS))
return IRQ_NONE;