4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Luu An Phu <phu.luuan@xxxxxxx> [ Upstream commit 13454c14550065fcc1705d6bd4ee6d40e057099f ] The flexcan_start_xmit() function compares the frame length with data register length to write frame content into data[0] and data[1] register. Data register length is 4 bytes and frame maximum length is 8 bytes. Fix the check that compares frame length with 3. Because the register length is 4. Signed-off-by: Luu An Phu <phu.luuan@xxxxxxx> Reviewed-by: Oliver Hartkopp <socketcan@xxxxxxxxxxxx> Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/can/flexcan.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -493,7 +493,7 @@ static int flexcan_start_xmit(struct sk_ data = be32_to_cpup((__be32 *)&cf->data[0]); flexcan_write(data, ®s->mb[FLEXCAN_TX_BUF_ID].data[0]); } - if (cf->can_dlc > 3) { + if (cf->can_dlc > 4) { data = be32_to_cpup((__be32 *)&cf->data[4]); flexcan_write(data, ®s->mb[FLEXCAN_TX_BUF_ID].data[1]); }