netdev - Re: Fw: Linux tcp_xmit_retransmit_queue use after free on 4.8-rc1 / master]

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Message-ID: <CAM_iQpW46DkWU2COW6tXUj3W==WQVkHT--qW8Hfus5ZiiKtYvA@mail.gmail.com>
Date:	Tue, 16 Aug 2016 13:32:58 -0700
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	Marco Grassi <marco.gra@...il.com>,
	Yuchung Cheng <ycheng@...gle.com>,
	Neal Cardwell <ncardwell@...gle.com>
Subject: Re: Fw: Linux tcp_xmit_retransmit_queue use after free on 4.8-rc1 / master]

On Tue, Aug 16, 2016 at 1:27 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> And tcp_add_write_queue_tail() looks like :
>
>
> static inline void tcp_add_write_queue_tail(struct sock *sk, struct sk_buff *skb)
> {
>         __tcp_add_write_queue_tail(sk, skb);
>
>         /* Queue it, remembering where we must start sending. */
>         if (sk->sk_send_head == NULL) {
>                 sk->sk_send_head = skb;
>
>                 if (tcp_sk(sk)->highest_sack == NULL)
>                         tcp_sk(sk)->highest_sack = skb;
>         }
> }
>

Ah, I never looked into tcp_add_write_queue_tail()...

So this bug seems exist after commit 6859d49475d4f32abe640372117e4b...