5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Li Lingfeng <lilingfeng3@xxxxxxxxxx>
[ Upstream commit 1a721de8489fa559ff4471f73c58bb74ac5580d3 ]
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@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Link: https://lore.kernel.org/r/20230831075900.1725842-1-lilingfeng@xxxxxxxxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
block/ioctl.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/block/ioctl.c b/block/ioctl.c
index cd506a9029630..8f39e413f12a3 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)))
--
2.40.1
