linux-kernel - [PATCH] fou: fix initialization of grc

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Message-Id: <20240906102839.202798-1-usama.anjum@collabora.com>
Date: Fri,  6 Sep 2024 15:28:39 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: "David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Kuniyuki Iwashima <kuniyu@...zon.com>
Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>,
	kernel@...labora.com,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] fou: fix initialization of grc

The grc must be initialize first. There can be a condition where if
fou is NULL, goto out will be executed and grc would be used
uninitialized.

Fixes: 7e4196935069 ("fou: Fix null-ptr-deref in GRO.")
Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
---
 net/ipv4/fou_core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/fou_core.c b/net/ipv4/fou_core.c
index 78b869b314921..3e30745e2c09a 100644
--- a/net/ipv4/fou_core.c
+++ b/net/ipv4/fou_core.c
@@ -336,11 +336,11 @@ static struct sk_buff *gue_gro_receive(struct sock *sk,
 	struct gro_remcsum grc;
 	u8 proto;
 
+	skb_gro_remcsum_init(&grc);
+
 	if (!fou)
 		goto out;
 
-	skb_gro_remcsum_init(&grc);
-
 	off = skb_gro_offset(skb);
 	len = off + sizeof(*guehdr);
 
-- 
2.39.2