fou: remove warn in gue_gro_receive on unsupported protocol
[ Upstream commit dd89a81d850fa9a65f67b4527c0e420d15bf836c ]
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 270136613bf7 ("fou: Do WARN_ON_ONCE in gue_gro_receive for bad
proto callbacks").
BUG=b/366405207
TEST=presubmit
RELEASE_NOTE=Fixes CVE-2024-44940 in the Linux kernel
cos-patch: security-high
Change-Id: I37f93bffdda0b4c92c01b0268dbc3fc0c456939b
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>
Signed-off-by: Kernel CVE Triage Automation <cloud-image-kernel-cve-triage-automation@prod.google.com>
Signed-off-by: Oleksandr Tymoshenko <ovt@google.com>
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/81439
Reviewed-by: Kevin Berry <kpberry@google.com>
Reviewed-by: Arnav Kansal <rnv@google.com>
Main-Branch-Verified: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c
index 135da75..c41af86 100644
--- a/net/ipv4/fou.c
+++ b/net/ipv4/fou.c
@@ -453,7 +453,7 @@ static struct sk_buff *gue_gro_receive(struct sock *sk,
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);
