In blk_mq_tag_to_rq in blk-mq.c in the upstream kernel, there is a possible use after free due to a race condition when a request has been previously freed by blk_mq_complete_request. This could lead to local escalation of privilege. Product: Android. Versions: Android kernel. Android ID: A-63083046.
https://www.debian.org/security/2018/dsa-4187
https://source.android.com/security/bulletin/2018-02-01
https://github.com/torvalds/linux/commit/0048b4837affd153897ed1222283492070027aa9