From: Eric Dumazet <eric.duma...@gmail.com>
Date: Mon, 14 Aug 2017 17:44:43 -0700
> From: Eric Dumazet <eduma...@google.com>
>
> Filtering the ACK packet was not put at the right place.
>
> At this place, we already allocated a child and put it
> into accept queue.
>
> We absolutely need to call tcp_child_process() to release
> its spinlock, or we will deadlock at accept() or close() time.
>
> Found by syzkaller team (Thanks a lot !)
>
> Fixes: 8fac365f63c8 ("tcp: Add a tcp_filter hook before handle ack packet")
> Signed-off-by: Eric Dumazet <eduma...@google.com>
> Reported-by: Dmitry Vyukov <dvyu...@google.com>
Applied, thanks.
