netdev - Re: [PATCH net] net: add pfmemalloc check in sk_add

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Message-ID: <1443778701.32531.53.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 02 Oct 2015 02:38:21 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, gthelen@...gle.com, mhocko@...e.com,
	mgorman@...e.de
Subject: Re: [PATCH net] net: add pfmemalloc check in sk_add_backlog()

On Tue, 2015-09-29 at 21:56 -0700, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Tue, 29 Sep 2015 18:52:25 -0700
> 
> > From: Eric Dumazet <edumazet@...gle.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 <edumazet@...gle.com>
> > Reported-by: Greg Thelen <gthelen@...gle.com>
> 
> Applied, thanks Eric.
Hi David

I could not find this patch in any of your trees, would you take a
look ?

Thanks !


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