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mscan: too much data copied to CAN frame due to 16 bit accesses 

Due to the 16 bit access to mscan registers there's too much data copied to
the zero initialized CAN frame when having an odd number of bytes to copy.
This patch ensures that only the requested bytes are copied by using an
8 bit access for the remaining byte.

Reported-by: Andre Naujoks <nautsch@gmail.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wolfgang Grandegger 2011-10-07 09:28:14 +00:00 committed by David S. Miller
parent cdaf557034
commit a3a4bfde8a
1 changed files with 8 additions and 3 deletions
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11
drivers/net/can/mscan/mscan.c
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@ -261,11 +261,13 @@ static netdev_tx_t mscan_start_xmit(struct sk_buff *skb, struct net_device *dev)
void __iomem *data = &regs->tx.dsr1_0;
u16 *payload = (u16 *)frame->data;
/* It is safe to write into dsr[dlc+1] */
for (i = 0; i < (frame->can_dlc + 1) / 2; i++) {
for (i = 0; i < frame->can_dlc / 2; i++) {
out_be16(data, *payload++);
data += 2 + _MSCAN_RESERVED_DSR_SIZE;
}
/* write remaining byte if necessary */
if (frame->can_dlc & 1)
out_8(data, frame->data[frame->can_dlc - 1]);
}
out_8(&regs->tx.dlr, frame->can_dlc);
@ -330,10 +332,13 @@ static void mscan_get_rx_frame(struct net_device *dev, struct can_frame *frame)
void __iomem *data = &regs->rx.dsr1_0;
u16 *payload = (u16 *)frame->data;
for (i = 0; i < (frame->can_dlc + 1) / 2; i++) {
for (i = 0; i < frame->can_dlc / 2; i++) {
*payload++ = in_be16(data);
data += 2 + _MSCAN_RESERVED_DSR_SIZE;
}
/* read remaining byte if necessary */
if (frame->can_dlc & 1)
frame->data[frame->can_dlc - 1] = in_8(data);
}
out_8(&regs->canrflg, MSCAN_RXF);