block: don't add or resize partition on the disk with GENHD_FL_NO_PART

commit 1a721de8489fa559ff4471f73c58bb74ac5580d3 upstream.

Commit a33df75c6328 ("block: use an xarray for disk->part_tbl") remove
disk_expand_part_tbl() in add_partition(), which means all kinds of
devices will support extended dynamic `dev_t`.
However, some devices with GENHD_FL_NO_PART are not expected to add or
resize partition.
Fix this by adding check of GENHD_FL_NO_PART before add or resize
partition.

Fixes: a33df75c6328 ("block: use an xarray for disk->part_tbl")
Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230831075900.1725842-1-lilingfeng@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/block/ioctl.c b/block/ioctl.c
index 9c5f637..3c475e4 100644 (file)
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -20,6 +20,8 @@ static int blkpg_do_ioctl(struct block_device *bdev,
        struct blkpg_partition p;
        long long start, length;
 
+       if (disk->flags & GENHD_FL_NO_PART)
+               return -EINVAL;
        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;
        if (copy_from_user(&p, upart, sizeof(struct blkpg_partition)))