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| author | Oliver Hartkopp <oliver@hartkopp.net> | 2009-12-12 04:13:21 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-12-13 19:47:42 -0800 |
| commit | c7cd606f60e7679c7f9eee7010f02a6f000209c1 (patch) | |
| tree | 31c19fd7617ede807757b0ae5c29d218587dc43f /drivers/net/can/bfin_can.c | |
| parent | d90a909e1f3e006a1d57fe11fd417173b6494701 (diff) | |
| download | linux-c7cd606f60e7679c7f9eee7010f02a6f000209c1.tar.gz | |
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>
Diffstat (limited to 'drivers/net/can/bfin_can.c')
| -rw-r--r-- | drivers/net/can/bfin_can.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/can/bfin_can.c b/drivers/net/can/bfin_can.c index c7fc1de28173..0ec1524523cc 100644 --- a/drivers/net/can/bfin_can.c +++ b/drivers/net/can/bfin_can.c @@ -392,7 +392,7 @@ static void bfin_can_rx(struct net_device *dev, u16 isrc) cf->can_id |= CAN_RTR_FLAG; /* get data length code */ - cf->can_dlc = bfin_read16(®->chl[obj].dlc); + cf->can_dlc = get_can_dlc(bfin_read16(®->chl[obj].dlc) & 0xF); /* get payload */ for (i = 0; i < 8; i += 2) { |