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>

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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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drivers/comedi/drivers/quatech_daqp_cs.c

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