From: Eric Dumazet <eric.duma...@gmail.com>
Date: Fri, 03 Feb 2017 14:59:38 -0800
> From: Eric Dumazet <eduma...@google.com>
>
> Splicing from TCP socket is vulnerable when a packet with URG flag is
> received and stored into receive queue.
>
> __tcp_splice_read() returns 0, and sk_wait_data() immediately
> returns since there is the problematic skb in queue.
>
> This is a nice way to burn cpu (aka infinite loop) and trigger
> soft lockups.
>
> Again, this gem was found by syzkaller tool.
>
> Fixes: 9c55e01c0cc8 ("[TCP]: Splice receive support.")
> Signed-off-by: Eric Dumazet <eduma...@google.com>
> Reported-by: Dmitry Vyukov <dvyu...@google.com>
> Cc: Willy Tarreau <w...@1wt.eu>
Applied and queued up for -stable, thanks Eric.
