raiden00pl opened a new pull request, #20938:
URL: https://github.com/apache/nuttx/pull/20938
## Summary
The character driver took the data length of every message from
can_dlc2bytes(), which with CONFIG_CAN_FD gives 12..64 bytes for DLC
9..15, also for classic frames. write() of such a classic message with
its 8 data bytes then returned 0 without sending it, and can_receive()
copied up to 64 bytes from the 8-byte data of a classic lower half.
Use the CAN FD length only when ch_edl is set and 8 bytes otherwise;
the DLC itself is kept. ctucanfd_pci, kvaser_pci and sim_canchar copy
8 bytes for these frames too.
## Impact
bugfix
## Testing
issue found with https://github.com/railab/nuttx-testlab
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