block: add check of 'minors' and 'first_minor' in device_add_disk()
authorLi Nan <linan122@huawei.com>
Tue, 19 Dec 2023 07:59:42 +0000 (15:59 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 25 Jan 2024 23:35:27 +0000 (15:35 -0800)
commited49fd2d46a412578fce946f11de07c116459ef7
tree8c095c83365831ec28a85ec84008e8e7bbe35c44
parent004e05c28c575919ecc67e5a34de794421cd624e
block: add check of 'minors' and 'first_minor' in device_add_disk()

[ Upstream commit 4c434392c4777881d01beada6701eff8c76b43fe ]

'first_minor' represents the starting minor number of disks, and
'minors' represents the number of partitions in the device. Neither
of them can be greater than MINORMASK + 1.

Commit e338924bd05d ("block: check minor range in device_add_disk()")
only added the check of 'first_minor + minors'. However, their sum might
be less than MINORMASK but their values are wrong. Complete the checks now.

Fixes: e338924bd05d ("block: check minor range in device_add_disk()")
Signed-off-by: Li Nan <linan122@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20231219075942.840255-1-linan666@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
block/genhd.c