mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-08-30 14:33:24 -04:00
Code Issues Packages Projects Releases Wiki Activity

comedi: pcmmio: Add sanity check to interrupt handler

Browse Source 
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/20260618102949.26607-10-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott
2026-06-18 11:09:16 +01:00
committed by Greg Kroah-Hartman
parent 956e847826
commit ea72e2fc90
1 changed files with 3 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/comedi/drivers/pcmmio.c
View File

@@ -362,6 +362,9 @@ static irqreturn_t interrupt_pcmmio(int irq, void *d)
unsigned int triggered;
unsigned char int_pend;
if (!dev->attached)
return IRQ_NONE;
/* are there any interrupts pending */
int_pend = inb(dev->iobase + PCMMIO_INT_PENDING_REG) & 0x07;
if (!int_pend)