Description
In the Linux kernel, the following vulnerability has been resolved: blk-mq: don't touch ->tagset in blk_mq_get_sq_hctx blk_mq_run_hw_queues() could be run when there isn't queued request and after queue is cleaned up, at that time tagset is freed, because tagset lifetime is covered by driver, and often freed after blk_cleanup_queue() returns. So don't touch ->tagset for figuring out current default hctx by the mapping built in request queue, so use-after-free on tagset can be avoided. Meantime this way should be fast than retrieving mapping from tagset.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
b6e68ee82585f2ee890b0a897a6aacbf49a467bb to < 460aa288c5cd0544dcf933a2f0ad0e8c6d2d35ffaffectedb6e68ee82585f2ee890b0a897a6aacbf49a467bb to < b140bac470b4f707cda59c7266214246238661dfaffectedb6e68ee82585f2ee890b0a897a6aacbf49a467bb to < 70fdd922c7bf8949f8df109cf2635dff64c90392affectedb6e68ee82585f2ee890b0a897a6aacbf49a467bb to < 5d05426e2d5fd7df8afc866b78c36b37b00188b7affected
Linux Linux
Default version status: affected
5.12affected0 to < 5.12unaffected5.15.47 to ≤ 5.15.*unaffected5.17.15 to ≤ 5.17.*unaffected5.18.4 to ≤ 5.18.*unaffected5.19 to ≤ *unaffected