On 10/21/20 9:11 AM, Joakim Zhang wrote: > I wonder if it's appropriate to ask this question here, why this RAW_DLC > issue might run into some buffer overflow issue? Will it cause frames dropped > finally? On the wire the dlc for CAN-2.0 frames ca go from 0...15. In the RX-path the DLC for CAN-2.0 frames is capped to 8. So userspace only ever sees a max dlc of 8. This way you can loop over the struct can_frame::data. If we pass the dlc of the wire uncapped, you may loop until 15 :) In the TX-path we currently drop CAN-2.0 frames with dlc >8. regards, Marc -- Pengutronix e.K. | Marc Kleine-Budde | Embedded Linux | https://www.pengutronix.de | Vertretung West/Dortmund | Phone: +49-231-2826-924 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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