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author | Coly Li <colyli@suse.de> | 2020-07-25 20:00:21 +0800 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-08-26 10:40:48 +0200 |
commit | b40753984979b1cd61a19d91b2044dd15a816e9f (patch) | |
tree | 7c4e5373c117d8d2f64f1d06b64843ceb97e8f55 /fs/btrfs/super.c | |
parent | 9f4f7c08d50b202a9e4478762f464524215789a6 (diff) |
bcache: avoid nr_stripes overflow in bcache_device_init()
[ Upstream commit 65f0f017e7be8c70330372df23bcb2a407ecf02d ]
For some block devices which large capacity (e.g. 8TB) but small io_opt
size (e.g. 8 sectors), in bcache_device_init() the stripes number calcu-
lated by,
DIV_ROUND_UP_ULL(sectors, d->stripe_size);
might be overflow to the unsigned int bcache_device->nr_stripes.
This patch uses the uint64_t variable to store DIV_ROUND_UP_ULL()
and after the value is checked to be available in unsigned int range,
sets it to bache_device->nr_stripes. Then the overflow is avoided.
Reported-and-tested-by: Ken Raeburn <raeburn@redhat.com>
Signed-off-by: Coly Li <colyli@suse.de>
Cc: stable@vger.kernel.org
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1783075
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs/btrfs/super.c')
0 files changed, 0 insertions, 0 deletions