mainline inclusion from mainline-v6.7-rc1 commit 4c434392c4777881d01beada6701eff8c76b43fe category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8SCHN
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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'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 --- block/genhd.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/block/genhd.c b/block/genhd.c index 4a16a424f57d..9aac842c3be4 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -432,7 +432,9 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk, DISK_MAX_PARTS); disk->minors = DISK_MAX_PARTS; } - if (disk->first_minor + disk->minors > MINORMASK + 1) + if (disk->first_minor > MINORMASK || + disk->minors > MINORMASK + 1 || + disk->first_minor + disk->minors > MINORMASK + 1) goto out_exit_elevator; } else { if (WARN_ON(disk->minors))