parport_serial: fix array overflow
The netmos_9xx5_combo type assumes that PCI SSID provides always the
correct value for the number of parallel and serial ports, but there are
indeed broken devices with wrong numbers, which may result in Oops.
This patch simply adds the check of the array range.
Reference: Novell bnc#447067
https://bugzilla.novell.com/show_bug.cgi?id=447067
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/parport/parport_serial.c b/drivers/parport/parport_serial.c
index e2e95b3..101ed49 100644
--- a/drivers/parport/parport_serial.c
+++ b/drivers/parport/parport_serial.c
@@ -70,6 +70,8 @@
* parallel ports and <S> is the number of serial ports.
*/
card->numports = (dev->subsystem_device & 0xf0) >> 4;
+ if (card->numports > ARRAY_SIZE(card->addr))
+ card->numports = ARRAY_SIZE(card->addr);
return 0;
}
