CVE-2021-47498 Information

Description

In the Linux kernel the following vulnerability has been resolved:

dm rq: don’t queue request to blk-mq during DM suspend

DM uses blk-mq’s quiesce/unquiesce to stop/start device mapper queue.

But blk-mq’s unquiesce may come from outside events such as elevator switch updating nr_requests or others and request may come during suspend so simply ask for blk-mq to requeue it.

Fixes one kernel panic issue when running updating nr_requests and dm-mpath suspend/resume stress test.

Reference

https://git.kernel.org/stable/c/8ca9745efe3528feb06ca4e117188038eea2d351 https://git.kernel.org/stable/c/b4459b11e84092658fa195a2587aff3b9637f0e7