Re: [net 03/11] can: isotp: TX-path: ensure that CAN frame flags are initialized
From: Oliver Hartkopp <socketcan@hartkopp.net>
Date: 2021-03-18 10:12:57
Also in:
linux-can
Hello Marc, I obviously missed these patches - but they are fine. Thanks! After checking your patch I was going after this missing initialization and detected that the outgoing CAN frame skbs from isotp.c were not properly zero initialized - so I sent a patch for it some minutes ago: https://lore.kernel.org/linux-can/20210318100233.1693-1-socketcan@hartkopp.net/T/#u (local) In fact I had > CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y > CONFIG_INIT_ON_FREE_DEFAULT_ON=y in my local kernel config therefore I was not able to see it on my own :-/ Best, Oliver On 16.03.21 09:20, Marc Kleine-Budde wrote:
quoted hunk ↗ jump to hunk
The previous patch ensures that the TX flags (struct can_isotp_ll_options::tx_flags) are 0 for classic CAN frames or a user configured value for CAN-FD frames. This patch sets the CAN frames flags unconditionally to the ISO-TP TX flags, so that they are initialized to a proper value. Otherwise when running "candump -x" on a classical CAN ISO-TP stream shows wrongly set "B" and "E" flags. | $ candump any,0:0,#FFFFFFFF -extA | [...] | can0 TX B E 713 [8] 2B 0A 0B 0C 0D 0E 0F 00 | can0 TX B E 713 [8] 2C 01 02 03 04 05 06 07 | can0 TX B E 713 [8] 2D 08 09 0A 0B 0C 0D 0E | can0 TX B E 713 [8] 2E 0F 00 01 02 03 04 05 Fixes: e057dd3fc20f ("can: add ISO 15765-2:2016 transport protocol") Link: https://lore.kernel.org/r/20210218215434.1708249-2-mkl@pengutronix.de (local) Cc: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> --- net/can/isotp.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-)diff --git a/net/can/isotp.c b/net/can/isotp.c index e32d446c121e..430976485d95 100644 --- a/net/can/isotp.c +++ b/net/can/isotp.c@@ -215,8 +215,7 @@ static int isotp_send_fc(struct sock *sk, int ae, u8 flowstatus) if (ae) ncf->data[0] = so->opt.ext_address; - if (so->ll.mtu == CANFD_MTU) - ncf->flags = so->ll.tx_flags; + ncf->flags = so->ll.tx_flags; can_send_ret = can_send(nskb, 1); if (can_send_ret)@@ -790,8 +789,7 @@ static enum hrtimer_restart isotp_tx_timer_handler(struct hrtimer *hrtimer) so->tx.sn %= 16; so->tx.bs++; - if (so->ll.mtu == CANFD_MTU) - cf->flags = so->ll.tx_flags; + cf->flags = so->ll.tx_flags; skb->dev = dev; can_skb_set_owner(skb, sk);@@ -939,8 +937,7 @@ static int isotp_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) } /* send the first or only CAN frame */ - if (so->ll.mtu == CANFD_MTU) - cf->flags = so->ll.tx_flags; + cf->flags = so->ll.tx_flags; skb->dev = dev; skb->sk = sk;