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block: add capacity validation in bdev_add_partition()

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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 <min15.li@samsung.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20230619091214.31615-1-min15.li@samsung.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Min Li 2023-06-19 09:12:14 +00:00 committed by Jens Axboe
parent 9a72a02456
commit 6d4e80db4e
1 changed files with 11 additions and 0 deletions
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11
block/partitions/core.c
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@ -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;