linux-kernel - Re: [PATCH] zram: set physical queue limits to avoid array out of bounds accesses

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Message-ID: <8386966d-8f97-5d6f-66b5-6a5131e9198f@suse.de>
Date:   Mon, 6 Mar 2017 11:25:14 +0100
From:   Hannes Reinecke <hare@...e.de>
To:     Johannes Thumshirn <jthumshirn@...e.de>, Jens Axboe <axboe@...com>,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>
Cc:     Christoph Hellwig <hch@....de>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        yizhan@...hat.com,
        Linux Block Layer Mailinglist <linux-block@...r.kernel.org>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] zram: set physical queue limits to avoid array out of
 bounds accesses

On 03/06/2017 11:23 AM, Johannes Thumshirn wrote:
> zram can handle at most SECTORS_PER_PAGE sectors in a bio's bvec. When using
> the NVMe over Fabrics loopback target which potentially sends a huge bulk of
> pages attached to the bio's bvec this results in a kernel panic because of
> array out of bounds accesses in zram_decompress_page().
> 
> Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
> ---
>  drivers/block/zram/zram_drv.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
Reviewed-by: Hannes Reinecke <hare@...e.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@...e.de			               +49 911 74053 688
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