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authorPaolo Abeni <pabeni@redhat.com>2021-07-03 01:38:43 +0300
committerDavid S. Miller <davem@davemloft.net>2021-07-03 02:19:14 +0300
commitb43c8909be52f2baca8884f967b418a88424494a (patch)
treeb09c16bdf085480edfe70d7f790d2b3fbedffe3e /net/ipv4
parentb22580233d473dbf7bbfa4f6549c09e2c80e9e64 (diff)
downloadlinux-b43c8909be52f2baca8884f967b418a88424494a.tar.xz
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>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/udp_offload.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 54e06b88af69..9dde1e5fb449 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -525,8 +525,10 @@ struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb,
if ((!sk && (skb->dev->features & NETIF_F_GRO_UDP_FWD)) ||
(sk && udp_sk(sk)->gro_enabled) || NAPI_GRO_CB(skb)->is_flist)
- pp = call_gro_receive(udp_gro_receive_segment, head, skb);
- return pp;
+ return call_gro_receive(udp_gro_receive_segment, head, skb);
+
+ /* no GRO, be sure flush the current packet */
+ goto out;
}
if (NAPI_GRO_CB(skb)->encap_mark ||