From: Eric Dumazet <eric.duma...@gmail.com>
Date: Tue, 14 Nov 2017 21:02:19 -0800
> From: Eric Dumazet <eduma...@google.com>
>
> syzbot easily found a regression added in our latest patches [1]
>
> No longer set tp->highest_sack to the head of the send queue since
> this is not logical and error prone.
>
> Only sack processing should maintain the pointer to an skb from rtx queue.
>
> We might in the future only remember the sequence instead of a pointer to skb,
> since rb-tree should allow a fast lookup.
...
> Fixes: 737ff314563c ("tcp: use sequence distance to detect reordering")
> Signed-off-by: Eric Dumazet <eduma...@google.com>
> Cc: Yuchung Cheng <ych...@google.com>
> Reported-by: syzbot <syzkal...@googlegroups.com>
Applied.
