can: pcan_usb: fix wrong memcpy() bytes length
authorStephane Grosjean <s.grosjean@peak-system.com>
Fri, 9 Aug 2013 09:44:06 +0000 (11:44 +0200)
committerDavid S. Miller <davem@davemloft.net>
Mon, 12 Aug 2013 04:51:49 +0000 (21:51 -0700)
Fix possibly wrong memcpy() bytes length since some CAN records received from
PCAN-USB could define a DLC field in range [9..15].
In that case, the real DLC value MUST be used to move forward the record pointer
but, only 8 bytes max. MUST be copied into the data field of the struct
can_frame object of the skb given to the network core.

Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/can/usb/peak_usb/pcan_usb.c

index 25723d8..925ab8e 100644 (file)
@@ -649,7 +649,7 @@ static int pcan_usb_decode_data(struct pcan_usb_msg_context *mc, u8 status_len)
                if ((mc->ptr + rec_len) > mc->end)
                        goto decode_failed;
 
-               memcpy(cf->data, mc->ptr, rec_len);
+               memcpy(cf->data, mc->ptr, cf->can_dlc);
                mc->ptr += rec_len;
        }