netdev - [PATCH net] udp: initialize is_flist with 0 in udp_gro

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Message-Id: <6014932c7cdef91c11cdb0dcf73dbf77b65f8638.1585582305.git.lucien.xin@gmail.com>
Date:   Mon, 30 Mar 2020 23:31:45 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>
Cc:     davem@...emloft.net,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Paolo Abeni <pabeni@...hat.com>
Subject: [PATCH net] udp: initialize is_flist with 0 in udp_gro_receive

Without NAPI_GRO_CB(skb)->is_flist initialized, when the dev doesn't
support NETIF_F_GRO_FRAGLIST, is_flist can still be set and fraglist
will be used in udp_gro_receive().

So fix it by initializing is_flist with 0 in udp_gro_receive.

Fixes: 9fd1ff5d2ac7 ("udp: Support UDP fraglist GRO/GSO.")
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/ipv4/udp_offload.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index 1a98583..e67a66f 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -453,6 +453,7 @@ struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb,
 	unsigned int off = skb_gro_offset(skb);
 	int flush = 1;
 
+	NAPI_GRO_CB(skb)->is_flist = 0;
 	if (skb->dev->features & NETIF_F_GRO_FRAGLIST)
 		NAPI_GRO_CB(skb)->is_flist = sk ? !udp_sk(sk)->gro_enabled: 1;
 
-- 
2.1.0