CVE-2022-49176: In the Linux kernel, the following vulnerability has been resolved:  bfq: fix use-after-free in bfq_dispatch_request  KASAN reports a use-after-free report when doing normal scsi-mq test  [69832.239032] ================================================================== [69832.241810] BUG: KASAN: use-after-free in bfq_dispatch_request+0x1045/0x44b0 [69832.243267] Read of size 8 at addr ffff88802622ba88 by task kworker/3:1H/155 [69832.244656] [69832.245007] CPU: 3 PID: 155 Comm: kworker/3:1H Not tainted 5.10.0-10295-g576c6382529e #8 [69832.246626] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [69832.249069] Workqueue: kblockd blk_mq_run_work_fn [69832.250022] Call Trace: [69832.250541]  dump_stack+0x9b/0xce [69832.251232]  ? bfq_dispatch_request+0x1045/0x44b0 [69832.252243]  print_address_description.constprop.6+0x3e/0x60 [69832.253381]  ? __cpuidle_text_end+0x5/0x5 [69832.254211]  ? vprintk_func+0x6b/0x120 [69832.254994]  ? bfq_dispatch_request+0x1045/0x44b0 [69832.255952]  ? bfq_dispatch_request+0x1045/0x44b0 [69832.256914]  kasan_report.cold.9+0x22/0x3a [69832.257753]  ? bfq_dispatch_request+0x1045/0x44b0 [69832.258755]  check_memory_region+0x1c1/0x1e0 [69832.260248]  bfq_dispatch_request+0x1045/0x44b0 [69832.261181]  ? bfq_bfqq_expire+0x2440/0x2440 [69832.262032]  ? blk_mq_delay_run_hw_queues+0xf9/0x170 [69832.263022]  __blk_mq_do_dispatch_sched+0x52f/0x830 [69832.264011]  ? blk_mq_sched_request_inserted+0x100/0x100 [69832.265101]  __blk_mq_sched_dispatch_requests+0x398/0x4f0 [69832.266206]  ? blk_mq_do_dispatch_ctx+0x570/0x570 [69832.267147]  ? __switch_to+0x5f4/0xee0 [69832.267898]  blk_mq_sched_dispatch_requests+0xdf/0x140 [69832.268946]  __blk_mq_run_hw_queue+0xc0/0x270 [69832.269840]  blk_mq_run_work_fn+0x51/0x60 [69832.278170]  process_one_work+0x6d4/0xfe0 [69832.278984]  worker_thread+0x91/0xc80 [69832.279726]  ? __kthread_parkme+0xb0/0x110 [69832.280554]  ? process_one_work+0xfe0/0xfe0 [69832.281414]  kthread+0x32d/0x3f0 [69832.282082]  ? kthread_park+0x170/0x170 [69832.282849]  ret_from_fork+0x1f/0x30 [69832.283573] [69832.283886] Allocated by task 7725: [69832.284599]  kasan_save_stack+0x19/0x40 [69832.285385]  __kasan_kmalloc.constprop.2+0xc1/0xd0 [69832.286350]  kmem_cache_alloc_node+0x13f/0x460 [69832.287237]  bfq_get_queue+0x3d4/0x1140 [69832.287993]  bfq_get_bfqq_handle_split+0x103/0x510 [69832.289015]  bfq_init_rq+0x337/0x2d50 [69832.289749]  bfq_insert_requests+0x304/0x4e10 [69832.290634]  blk_mq_sched_insert_requests+0x13e/0x390 [69832.291629]  blk_mq_flush_plug_list+0x4b4/0x760 [69832.292538]  blk_flush_plug_list+0x2c5/0x480 [69832.293392]  io_schedule_prepare+0xb2/0xd0 [69832.294209]  io_schedule_timeout+0x13/0x80 [69832.295014]  wait_for_common_io.constprop.1+0x13c/0x270 [69832.296137]  submit_bio_wait+0x103/0x1a0 [69832.296932]  blkdev_issue_discard+0xe6/0x160 [69832.297794]  blk_ioctl_discard+0x219/0x290 [69832.298614]  blkdev_common_ioctl+0x50a/0x1750 [69832.304715]  blkdev_ioctl+0x470/0x600 [69832.305474]  block_ioctl+0xde/0x120 [69832.306232]  vfs_ioctl+0x6c/0xc0 [69832.306877]  __se_sys_ioctl+0x90/0xa0 [69832.307629]  do_syscall_64+0x2d/0x40 [69832.308362]  entry_SYSCALL_64_after_hwframe+0x44/0xa9 [69832.309382] [69832.309701] Freed by task 155: [69832.310328]  kasan_save_stack+0x19/0x40 [69832.311121]  kasan_set_track+0x1c/0x30 [69832.311868]  kasan_set_free_info+0x1b/0x30 [69832.312699]  __kasan_slab_free+0x111/0x160 [69832.313524]  kmem_cache_free+0x94/0x460 [69832.314367]  bfq_put_queue+0x582/0x940 [69832.315112]  __bfq_bfqd_reset_in_service+0x166/0x1d0 [69832.317275]  bfq_bfqq_expire+0xb27/0x2440 [69832.318084]  bfq_dispatch_request+0x697/0x44b0 [69832.318991]  __blk_mq_do_dispatch_sched+0x52f/0x830 [69832.319984]  __blk_mq_sched_dispatch_requests+0x398/0x4f0 [69832.321087]  blk_mq_sched_dispatch_requests+0xdf/0x140 [69832.322225]  __blk_mq_run_hw_queue+0xc0/0x270 [69832.323114]  blk_mq_run_work_fn+0x51/0x6 ---truncated---