From: Eric Dumazet <eric.duma...@gmail.com>
Date: Tue, 29 Sep 2015 18:52:25 -0700
> From: Eric Dumazet <eduma...@google.com>
>
> Greg reported crashes hitting the following check in __sk_backlog_rcv()
>
> BUG_ON(!sock_flag(sk, SOCK_MEMALLOC));
>
> The pfmemalloc bit is currently checked in sk_filter().
>
> This works correctly for TCP, because sk_filter() is ran in
> tcp_v[46]_rcv() before hitting the prequeue or backlog checks.
>
> For UDP or other protocols, this does not work, because the sk_filter()
> is ran from sock_queue_rcv_skb(), which might be called _after_ backlog
> queuing if socket is owned by user by the time packet is processed by
> softirq handler.
>
> Fixes: b4b9e35585089 ("netvm: set PF_MEMALLOC as appropriate during SKB
> processing")
> Signed-off-by: Eric Dumazet <eduma...@google.com>
> Reported-by: Greg Thelen <gthe...@google.com>
Applied, thanks Eric.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
