netdev - [PATCH] net: Set trailer iff skb1 is the last one

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Date:   Thu, 27 Aug 2020 07:29:22 -0400
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>, <pshelar@....org>,
        <fw@...len.de>, <martin.varghese@...ia.com>, <edumazet@...gle.com>,
        <dcaratti@...hat.com>, <steffen.klassert@...unet.com>,
        <pabeni@...hat.com>, <shmulik@...anetworks.com>,
        <kyk.segfault@...il.com>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: [PATCH] net: Set trailer iff skb1 is the last one

Set trailer iff skb1 is the skbuff where the tailbits space begins.

Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
 net/core/skbuff.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 0b24aed04060..18ed56316e56 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -4488,8 +4488,9 @@ int skb_cow_data(struct sk_buff *skb, int tailbits, struct sk_buff **trailer)
 			skb1 = skb2;
 		}
 		elt++;
-		*trailer = skb1;
 		skb_p = &skb1->next;
+		if (!*skb_p)
+			*trailer = skb1;
 	}
 
 	return elt;
-- 
2.19.1