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When EF10 RXDP firmware is operating in cut-through mode, packet length
is not known at the time the RX prefix is generated, so it is left as
zero and RX event merging is inhibited to ensure that the length is
available in the RX event. However, it has been found that in certain
circumstances the RX events for these packets still get merged,
meaning the driver cannot read the length from the RX event, and tries
to use the length from the prefix.
The resulting zero-length SKBs cause crashes in GRO since commit
1d11fa696733 ("net-gro: remove GRO_DROP"), so add a check to the driver
to detect these zero-length RX events and discard the packet.
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
ae074e2b2f