From 6d4e80db4ebe76c4a4b6ffb6547cb168275204ef Mon Sep 17 00:00:00 2001 From: Min Li Date: Mon, 19 Jun 2023 09:12:14 +0000 Subject: [PATCH] block: add capacity validation in bdev_add_partition() In the function bdev_add_partition(),there is no check that the start and end sectors exceed the size of the disk before calling add_partition. When we call the block's ioctl interface directly to add a partition, and the capacity of the disk is set to 0 by driver,the command will continue to execute. Signed-off-by: Min Li Reviewed-by: Christoph Hellwig Reviewed-by: Damien Le Moal Link: https://lore.kernel.org/r/20230619091214.31615-1-min15.li@samsung.com Signed-off-by: Jens Axboe --- block/partitions/core.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/block/partitions/core.c b/block/partitions/core.c index 87a21942d606..13a7341299a9 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -441,10 +441,21 @@ static bool partition_overlaps(struct gendisk *disk, sector_t start, int bdev_add_partition(struct gendisk *disk, int partno, sector_t start, sector_t length) { + sector_t capacity = get_capacity(disk), end; struct block_device *part; int ret; mutex_lock(&disk->open_mutex); + if (check_add_overflow(start, length, &end)) { + ret = -EINVAL; + goto out; + } + + if (start >= capacity || end > capacity) { + ret = -EINVAL; + goto out; + } + if (!disk_live(disk)) { ret = -ENXIO; goto out;