[PATCH] md: check bio address after mapping through partitions. (5ddfe969) · Commits · 戴 / test

block/ll_rw_blk.c

+20 −4

Original line number	Diff line number	Diff line
		@@ -2999,6 +2999,7 @@ void generic_make_request(struct bio *bio)
		{
		request_queue_t *q;
		sector_t maxsector;
		sector_t old_sector;
		int ret, nr_sectors = bio_sectors(bio);
		dev_t old_dev;

		@@ -3027,7 +3028,7 @@ void generic_make_request(struct bio *bio)
		* NOTE: we don't repeat the blk_size check for each new device.
		* Stacking drivers are expected to know what they are doing.
		*/
		maxsector = -1;
		old_sector = -1;
		old_dev = 0;
		do {
		char b[BDEVNAME_SIZE];
		@@ -3061,15 +3062,30 @@ end_io:
		*/
		blk_partition_remap(bio);

		if (maxsector != -1)
		if (old_sector != -1)
		blk_add_trace_remap(q, bio, old_dev, bio->bi_sector,
		maxsector);
		old_sector);

		blk_add_trace_bio(q, bio, BLK_TA_QUEUE);

		maxsector = bio->bi_sector;
		old_sector = bio->bi_sector;
		old_dev = bio->bi_bdev->bd_dev;

		maxsector = bio->bi_bdev->bd_inode->i_size >> 9;
		if (maxsector) {
		sector_t sector = bio->bi_sector;

		if (maxsector < nr_sectors \|\| maxsector - nr_sectors < sector) {
		/*
		* This may well happen - partitions are not checked
		* to make sure they are within the size of the
		* whole device.
		*/
		handle_bad_sector(bio);
		goto end_io;
		}
		}

		ret = q->make_request_fn(q, bio);
		} while (ret);
		}