From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Damien Le Moal <damien.lemoal@wdc.com>
Cc: stable@vger.kernel.org, Jens Axboe <axboe@kernel.dk>
Subject: Re: [PATCH] null_blk: Fix zone size initialization
Date: Mon, 4 Jan 2021 11:53:20 +0100 [thread overview]
Message-ID: <X/LzoKkYXJMdfhlJ@kroah.com> (raw)
In-Reply-To: <20210104061044.664481-1-damien.lemoal@wdc.com>
On Mon, Jan 04, 2021 at 03:10:44PM +0900, Damien Le Moal wrote:
> commit 0ebcdd702f49aeb0ad2e2d894f8c124a0acc6e23 upstream.
>
> For a null_blk device with zoned mode enabled is currently initialized
> with a number of zones equal to the device capacity divided by the zone
> size, without considering if the device capacity is a multiple of the
> zone size. If the zone size is not a divisor of the capacity, the zones
> end up not covering the entire capacity, potentially resulting is out
> of bounds accesses to the zone array.
>
> Fix this by adding one last smaller zone with a size equal to the
> remainder of the disk capacity divided by the zone size if the capacity
> is not a multiple of the zone size. For such smaller last zone, the zone
> capacity is also checked so that it does not exceed the smaller zone
> size.
Now queued up, thanks.
greg k-h
next prev parent reply other threads:[~2021-01-04 10:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-28 11:49 FAILED: patch "[PATCH] null_blk: Fix zone size initialization" failed to apply to 5.4-stable tree gregkh
2021-01-04 6:10 ` [PATCH] null_blk: Fix zone size initialization Damien Le Moal
2021-01-04 10:53 ` Greg Kroah-Hartman [this message]
2021-01-04 6:13 ` FAILED: patch "[PATCH] null_blk: Fix zone size initialization" failed to apply to 5.4-stable tree Damien Le Moal
-- strict thread matches above, loose matches on Subject: below --
2021-01-04 10:52 FAILED: patch "[PATCH] null_blk: Fix zone size initialization" failed to apply to 4.19-stable tree gregkh
2021-01-04 12:11 ` [PATCH] null_blk: Fix zone size initialization Damien Le Moal
2021-01-04 12:25 ` Greg Kroah-Hartman
2020-12-28 11:49 FAILED: patch "[PATCH] null_blk: Fix zone size initialization" failed to apply to 4.19-stable tree gregkh
2021-01-04 6:11 ` [PATCH] null_blk: Fix zone size initialization Damien Le Moal
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