udp: properly flush normal packet at GRO time
authorPaolo Abeni <pabeni@redhat.com>
Fri, 2 Jul 2021 22:38:43 +0000 (00:38 +0200)
committerDavid S. Miller <davem@davemloft.net>
Fri, 2 Jul 2021 23:19:14 +0000 (16:19 -0700)
commitb43c8909be52f2baca8884f967b418a88424494a
treeb09c16bdf085480edfe70d7f790d2b3fbedffe3e
parentb22580233d473dbf7bbfa4f6549c09e2c80e9e64
udp: properly flush normal packet at GRO time

If an UDP packet enters the GRO engine but is not eligible
for aggregation and is not targeting an UDP tunnel,
udp_gro_receive() will not set the flush bit, and packet
could delayed till the next napi flush.

Fix the issue ensuring non GROed packets traverse
skb_gro_flush_final().

Reported-and-tested-by: Matthias Treydte <mt@waldheinz.de>
Fixes: 18f25dc39990 ("udp: skip L4 aggregation for UDP tunnel packets")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/udp_offload.c