can: dev: __can_get_echo_skb(): fix real payload length return value for RTR frames

BugLink: https://bugs.launchpad.net/bugs/1905618
[ Upstream commit ed3320cec279407a86bc4c72edc4a39eb49165ec ]

The can_get_echo_skb() function returns the number of received bytes to
be used for netdev statistics. In the case of RTR frames we get a valid
(potential non-zero) data length value which has to be passed for further
operations. But on the wire RTR frames have no payload length. Therefore
the value to be used in the statistics has to be zero for RTR frames.

Reported-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Link: https://lore.kernel.org/r/20201020064443.80164-1-socketcan@hartkopp.net
Fixes: cf5046b309b3 ("can: dev: let can_get_echo_skb() return dlc of CAN frame")
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index de3c589b1ae0e392458a6b6545e4f152d875f7b5..448d1548cca39e0668b51deab5d0a570f720332c 100644 (file)
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -486,9 +486,13 @@ __can_get_echo_skb(struct net_device *dev, unsigned int idx, u8 *len_ptr)
                 */
                struct sk_buff *skb = priv->echo_skb[idx];
                struct canfd_frame *cf = (struct canfd_frame *)skb->data;
-               u8 len = cf->len;
 
-               *len_ptr = len;
+               /* get the real payload length for netdev statistics */
+               if (cf->can_id & CAN_RTR_FLAG)
+                       *len_ptr = 0;
+               else
+                       *len_ptr = cf->len;
+
                priv->echo_skb[idx] = NULL;
 
                return skb;