netdev - [PATCH] llc: fix uninit-value in __llc_lookup

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Message-ID: <tencent_269592755DA55D9B19384F870D9D25B18D07@qq.com>
Date: Wed,  6 Dec 2023 09:55:15 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+b5ad66046b913bc04c6f@...kaller.appspotmail.com
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	pabeni@...hat.com,
	syzkaller-bugs@...glegroups.com
Subject: [PATCH] llc: fix uninit-value in __llc_lookup_established

llc only supports ETH_P_802_2 protocol, so drop the skb when the protocol is 
not it.

Reported-by: syzbot+b5ad66046b913bc04c6f@...kaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@...com>
---
 net/llc/llc_input.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/llc/llc_input.c b/net/llc/llc_input.c
index 51bccfb00a9c..16b2c57f38c2 100644
--- a/net/llc/llc_input.c
+++ b/net/llc/llc_input.c
@@ -141,7 +141,8 @@ static inline int llc_fixup_skb(struct sk_buff *skb)
 			return 0;
 		if (unlikely(pskb_trim_rcsum(skb, data_size)))
 			return 0;
-	}
+	} else
+		return 0;
 	return 1;
 }
 
-- 
2.43.0