linux-kernel - Re: net: non contiguous allocations passed to build

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Message-ID: <1429913468.22254.137.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 24 Apr 2015 15:11:08 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: net: non contiguous allocations passed to build_skb

On Fri, 2015-04-24 at 15:02 -0700, Eric Dumazet wrote:
> On Fri, 2015-04-24 at 17:28 -0400, Sasha Levin wrote:
> > Hey Eric,
> > 
> > Your commit 79930f5892e ("net: do not deplete pfmemalloc reserve") assumes that
> > build_skb() will only handle contiguous allocations because of the
> > virt_to_head_page().
> > 
> > However, netlink_sendmsg() calls build_skb() with vmalloc()ed memory, causing:
> 
> gosh. netlink & vmalloc() striked again.

I'll send a fix, thanks for the report.


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