netdev - Re: [PATCH net-next] net: fix percpu memory leaks

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Date:	Mon, 02 Nov 2015 19:32:03 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Dmitry Vyukov <dvyukov@...gle.com>
Subject: Re: [PATCH net-next] net: fix percpu memory leaks

On Mon, Nov 2, 2015, at 18:03, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> This patch fixes following problems :
> 
> 1) percpu_counter_init() can return an error, therefore
>   init_frag_mem_limit() must propagate this error so that
>   inet_frags_init_net() can do the same up to its callers.
> 
> 2) If ip[46]_frags_ns_ctl_register() fail, we must unwind
>    properly and free the percpu_counter.
> 
> Without this fix, we leave freed object in percpu_counters
> global list (if CONFIG_HOTPLUG_CPU) leading to crashes.
> 
> This bug was detected by KASAN and syzkaller tool
> (http://github.com/google/syzkaller)
> 
> Fixes: 6d7b857d541e ("net: use lib/percpu_counter API for fragmentation
> mem accounting")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: Hannes Frederic Sowa <hannes@...essinduktion.org>
> Cc: Jesper Dangaard Brouer <brouer@...hat.com>

Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>

Syzkaller tool looks amazing, seems like it got support for unshare :).

Thanks!
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