On 6/16/23 01:09, min15.li wrote:
> 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: min15.li <min15.li@xxxxxxxxxxx>
> ---
> block/partitions/core.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/block/partitions/core.c b/block/partitions/core.c
> index 49e0496ff23c..9806a804e1a4 100644
> --- a/block/partitions/core.c
> +++ b/block/partitions/core.c
> @@ -445,6 +445,12 @@ int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
> goto out;
> }
>
> + if (start >= get_capacity(disk) ||
> + start + length > get_capacity(disk)) {
declaring:
sector_t capacity = get_capacity(disk);
at the beginning of the function would make this check prettier and fit on one line.
> + ret = -EINVAL;
> + goto out;
> + }
> +
> if (partition_overlaps(disk, start, length, -1)) {
> ret = -EBUSY;
> goto out;
--
Damien Le Moal
Western Digital Research
