netdev - [PATCH 5.10] fou: remove warn in gue_gro

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Message-ID: <20250120104358.21574-1-arefev@swemel.ru>
Date: Mon, 20 Jan 2025 13:43:57 +0300
From: Denis Arefev <arefev@...mel.ru>
To: stable@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: "David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Jakub Kicinski <kuba@...nel.org>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org,
	Willem de Bruijn <willemb@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH 5.10] fou: remove warn in gue_gro_receive on unsupported protocol

From: Willem de Bruijn <willemb@...gle.com>

commit dd89a81d850fa9a65f67b4527c0e420d15bf836c upstream.

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@...gle.com>
Reviewed-by: Eric Dumazet <edumazet@...gle.com>
Link: https://lore.kernel.org/r/20240614122552.1649044-1-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Denis Arefev <arefev@...mel.ru>
---
Backport fix for CVE-2024-44940
Link: https://www.cve.org/CVERecord/?id=CVE-2024-44940
---
 net/ipv4/fou.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/fou.c b/net/ipv4/fou.c
index 1d67df4d8ed6..b1a8e4eec3f6 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);
-- 
2.43.0