From: Eric Dumazet <eric.duma...@gmail.com>
Date: Wed, 16 Aug 2017 10:36:47 -0700
> From: Eric Dumazet <eduma...@google.com>
>
> As found by syzkaller, malicious users can set whatever tx_queue_len
> on a tun device and eventually crash the kernel.
>
> Lets remove the ALIGN(XXX, SMP_CACHE_BYTES) thing since a small
> ring buffer is not fast anyway.
>
> Fixes: 2e0ab8ca83c1 ("ptr_ring: array based FIFO for pointers")
> Signed-off-by: Eric Dumazet <eduma...@google.com>
> Reported-by: Dmitry Vyukov <dvyu...@google.com>
Applied and queued up for -stable.
