netdev - Re: [PATCH net] sctp: increase sk_wmem_alloc when head->truesize is increased

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Message-Id: <20181127.154248.292898274922488309.davem@davemloft.net>
Date:   Tue, 27 Nov 2018 15:42:48 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, linux-sctp@...r.kernel.org,
        marcelo.leitner@...il.com, nhorman@...driver.com
Subject: Re: [PATCH net] sctp: increase sk_wmem_alloc when head->truesize
 is increased

From: Xin Long <lucien.xin@...il.com>
Date: Mon, 26 Nov 2018 14:52:44 +0800

> I changed to count sk_wmem_alloc by skb truesize instead of 1 to
> fix the sk_wmem_alloc leak caused by later truesize's change in
> xfrm in Commit 02968ccf0125 ("sctp: count sk_wmem_alloc by skb
> truesize in sctp_packet_transmit").
> 
> But I should have also increased sk_wmem_alloc when head->truesize
> is increased in sctp_packet_gso_append() as xfrm does. Otherwise,
> sctp gso packet will cause sk_wmem_alloc underflow.
> 
> Fixes: 02968ccf0125 ("sctp: count sk_wmem_alloc by skb truesize in sctp_packet_transmit")
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied.