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[SRU,N,1/1] fou: remove warn in gue_gro_receive on unsupported protocol

Message ID 20240925171425.96801-2-bethany.jamison@canonical.com
State New
Headers show
Series [SRU,N,1/1] fou: remove warn in gue_gro_receive on unsupported protocol | expand

Commit Message

Bethany Jamison Sept. 25, 2024, 5:14 p.m. UTC 
From: Willem de Bruijn <willemb@google.com>

[ 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").

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>
(cherry picked from commit 440ab7f97261bc28501636a13998e1b1946d2e79 linux-6.10.y)
CVE-2024-44940
Signed-off-by: Bethany Jamison <bethany.jamison@canonical.com>
---
 net/ipv4/fou_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/net/ipv4/fou_core.c b/net/ipv4/fou_core.c
index 0c41076e31eda..b38b82ae903de 100644
--- a/net/ipv4/fou_core.c
+++ b/net/ipv4/fou_core.c
@@ -433,7 +433,7 @@  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);