Merge "zram: avoid access beyond the zram device"

 */

static inline int valid_io_request(struct zram *zram, struct bio *bio)

{

	if (unlikely(

		(bio->bi_sector >= (zram->disksize >> SECTOR_SHIFT)) ||

		(bio->bi_sector & (ZRAM_SECTOR_PER_LOGICAL_BLOCK - 1)) ||

		(bio->bi_size & (ZRAM_LOGICAL_BLOCK_SIZE - 1)))) {

	u64 start, end, bound;

	/* unaligned request */

	if (unlikely(bio->bi_sector & (ZRAM_SECTOR_PER_LOGICAL_BLOCK - 1)))

		return 0;

	if (unlikely(bio->bi_size & (ZRAM_LOGICAL_BLOCK_SIZE - 1)))

		return 0;

	start = bio->bi_sector;

	end = start + (bio->bi_size >> SECTOR_SHIFT);

	bound = zram->disksize >> SECTOR_SHIFT;

	/* out of range range */

	if (unlikely(start >= bound || end >= bound || start > end))

		return 0;

	}

	/* I/O request is valid */

	return 1;