linux/drivers/net/can/mscan
Oliver Hartkopp c7cd606f60 can: Fix data length code handling in rx path
A valid CAN dataframe can have a data length code (DLC) of 0 .. 8 data bytes.

When reading the CAN controllers register the 4-bit value may contain values
from 0 .. 15 which may exceed the reserved space in the socket buffer!

The ISO 11898-1 Chapter 8.4.2.3 (DLC field) says that register values > 8
should be reduced to 8 without any error reporting or frame drop.

This patch introduces a new helper macro to cast a given 4-bit data length
code (dlc) to __u8 and ensure the DLC value to be max. 8 bytes.

The different handlings in the rx path of the CAN netdevice drivers are fixed.

Signed-off-by: Oliver Hartkopp <oliver@hartkopp.net>
Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-13 19:47:42 -08:00
..
Kconfig net/can/mscan: improve build 2009-11-17 03:57:34 -08:00
Makefile net/can/mscan: improve build 2009-11-17 03:57:34 -08:00
mpc5xxx_can.c net/can/mscan: improve build 2009-11-17 03:57:34 -08:00
mscan.c can: Fix data length code handling in rx path 2009-12-13 19:47:42 -08:00
mscan.h net/can/mscan: replace hardcoded values with defines 2009-11-17 03:54:04 -08:00