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fou: remove warn in gue_gro_receive on unsupported protocol

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[ Upstream commit dd89a81d85 ]

Drop the WARN_ON_ONCE inn gue_gro_receive if the encapsulated type is
not known or does not have a GRO handler.

Such a packet is easily constructed. Syzbot generates them and sets
off this warning.

Remove the warning as it is expected and not actionable.

The warning was previously reduced from WARN_ON to WARN_ON_ONCE in
commit 270136613b ("fou: Do WARN_ON_ONCE in gue_gro_receive for bad
proto callbacks").

Signed-off-by: Willem de Bruijn <willemb@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://lore.kernel.org/r/20240614122552.1649044-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Willem de Bruijn 2024-06-14 08:25:18 -04:00 committed by Greg Kroah-Hartman
parent 263df78166
commit 3db4395332
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/fou_core.c
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@ -433,7 +433,7 @@ next_proto:
offloads = NAPI_GRO_CB(skb)->is_ipv6 ? inet6_offloads : inet_offloads;
ops = rcu_dereference(offloads[proto]);
if (WARN_ON_ONCE(!ops || !ops->callbacks.gro_receive))
if (!ops || !ops->callbacks.gro_receive)
goto out;
pp = call_gro_receive(ops->callbacks.gro_receive, head, skb);