The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 1a721de8489fa559ff4471f73c58bb74ac5580d3 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023090947-apprehend-immobile-0fb5@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

1a721de8489f ("block: don't add or resize partition on the disk with GENHD_FL_NO_PART")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 1a721de8489fa559ff4471f73c58bb74ac5580d3 Mon Sep 17 00:00:00 2001 From: Li Lingfeng lilingfeng3@huawei.com Date: Thu, 31 Aug 2023 15:59:00 +0800 Subject: [PATCH] block: don't add or resize partition on the disk with GENHD_FL_NO_PART

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.co... Signed-off-by: Jens Axboe axboe@kernel.dk

diff --git a/block/ioctl.c b/block/ioctl.c index 648670ddb164..d5f5cd61efd7 100644 --- 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)))