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Revert "Revert "block: nbd: add sanity check for first_minor""

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This reverts commit 0daa75bf75.

These problems such as:
https://lore.kernel.org/all/CACPK8XfUWoOHr-0RwRoYoskia4fbAbZ7DYf5wWBnv6qUnGq18w@mail.gmail.com/
It was introduced by introduced by commit b1a811633f73 ("block: nbd: add sanity check for first_minor")
and has been have been fixed by commit e4c4871a7394 ("nbd: fix max value for 'first_minor'").

Cc: Joel Stanley <joel@jms.id.au>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Pavel Skripkin <paskripkin@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Sasha Levin <sashal@kernel.org>
Cc: stable@vger.kernel.org # v5.10+
Signed-off-by: Wen Yang <wenyang.linux@foxmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wen Yang
2023-02-21 02:04:46 +08:00
committed by Greg Kroah-Hartman
parent 3b6ce54cfa
commit f3f6b33b77
1 changed files with 10 additions and 0 deletions
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10
drivers/block/nbd.c
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@@ -1771,7 +1771,17 @@ static int nbd_dev_add(int index)
refcount_set(&nbd->refs, 1);
INIT_LIST_HEAD(&nbd->list);
disk->major = NBD_MAJOR;
/* Too big first_minor can cause duplicate creation of
* sysfs files/links, since first_minor will be truncated to
* byte in __device_add_disk().
*/
disk->first_minor = index << part_shift;
if (disk->first_minor > 0xff) {
err = -EINVAL;
goto out_free_idr;
}
disk->fops = &nbd_fops;
disk->private_data = nbd;
sprintf(disk->disk_name, "nbd%d", index);