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

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Message-ID: <bffdf6fc-becb-32c7-2669-fb18ebc3e172@fb.com>
Date:   Mon, 6 Mar 2017 13:19:56 -0700
From:   Jens Axboe <axboe@...com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     Johannes Thumshirn <jthumshirn@...e.de>,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>,
        Christoph Hellwig <hch@....de>,
        "Sergey Senozhatsky" <sergey.senozhatsky.work@...il.com>,
        Hannes Reinecke <hare@...e.de>, <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 01:18 PM, Andrew Morton wrote:
> On Mon, 6 Mar 2017 08:21:11 -0700 Jens Axboe <axboe@...com> wrote:
> 
>> On 03/06/2017 03:23 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().
>>
>> Applied, thanks.
> 
> With an added cc:stable, hopefully?

I didn't. But I can email it to stable@ when it lands in Linus's tree.

-- 
Jens Axboe