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comedi: pcm818: 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/20260618102949.26607-9-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2026-06-18 11:09:15 +01:00 committed by Greg Kroah-Hartman
parent 4fdac5090c
commit 956e847826
1 changed files with 2 additions and 1 deletions
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3
drivers/comedi/drivers/pcl818.c
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@ -534,13 +534,14 @@ static irqreturn_t pcl818_interrupt(int irq, void *d)
struct comedi_device *dev = d;
struct pcl818_private *devpriv = dev->private;
struct comedi_subdevice *s = dev->read_subdev;
struct comedi_cmd *cmd = &s->async->cmd;
struct comedi_cmd *cmd;
if (!dev->attached || !devpriv->ai_cmd_running) {
pcl818_ai_clear_eoc(dev);
return IRQ_HANDLED;
}
cmd = &s->async->cmd;
if (devpriv->ai_cmd_canceled) {
/*
* The cleanup from ai_cancel() has been delayed