On 11/20/25 6:49 PM, Dmitry Skorodumov wrote:

Packets with pkt_type == PACKET_LOOPBACK are captured by
handle_frame() function, but they don't have L2 header.
We should not process them in handle_mode_l2().

This doesn't affect old L2 functionality, since handling
was anyway incorrect.

Handle them the same way as in br_handle_frame():
just pass the skb.

To observe invalid behaviour, just start "ping -b" on bcast address
of port-interface.

Signed-off-by: Dmitry Skorodumov <redacted>

Again, this looks like a fix suitable for 'net'.

Also the condition described above looks easily reproducible, you should
add a specific self-test.

/P