Commit c26ea58d authored by Yu Kuai's avatar Yu Kuai Committed by Zheng Zengkai
Browse files

dm: switch to rq-based after queue is initialized 

hulk inclusion
category: bugfix
bugzilla: 187345, https://gitee.com/openeuler/kernel/issues/I5L5ZG


CVE: NA

--------------------------------

Otherwise, null pointer crash can be triggered to handle bio in
blk_mq_submit_bio() while queue is not initialized.

Signed-off-by: default avatarYu Kuai <yukuai3@huawei.com>
Reviewed-by: default avatarJason Yan <yanaijie@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent 5257b502

drivers/md/dm.c

+5 −1
Original line number Diff line number Diff line
@@ -2149,12 +2149,16 @@ int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t) 


	switch (type) {

	case DM_TYPE_REQUEST_BASED:

		md->disk->fops = &dm_rq_blk_dops;

		r = dm_mq_init_request_queue(md, t);

		if (r) {

			DMERR("Cannot initialize queue for request-based dm mapped device");

			return r;

		}

		/*

		 * Change the fops after queue is initialized, so that bio won't

		 * issued by rq-based path until that.

		 */

		md->disk->fops = &dm_rq_blk_dops;

		break;

	case DM_TYPE_BIO_BASED:

	case DM_TYPE_DAX_BIO_BASED: