CVE-2021-47622

In the Linux kernel, the following vulnerability has been resolved:
scsi: ufs: Fix a deadlock in the error handler
The following deadlock has been observed on a test setup:

• All tags allocated
• The SCSI error handler calls ufshcd_eh_host_reset_handler()
• ufshcd_eh_host_reset_handler() queues work that calls
  ufshcd_err_handler()
• ufshcd_err_handler() locks up as follows:
  Workqueue: ufs_eh_wq_0 ufshcd_err_handler.cfi_jt
  Call trace:
  __switch_to+0x298/0x5d8
  __schedule+0x6cc/0xa94
  schedule+0x12c/0x298
  blk_mq_get_tag+0x210/0x480
  __blk_mq_alloc_request+0x1c8/0x284
  blk_get_request+0x74/0x134
  ufshcd_exec_dev_cmd+0x68/0x640
  ufshcd_verify_dev_init+0x68/0x35c
  ufshcd_probe_hba+0x12c/0x1cb8
  ufshcd_host_reset_and_restore+0x88/0x254
  ufshcd_reset_and_restore+0xd0/0x354
  ufshcd_err_handler+0x408/0xc58
  process_one_work+0x24c/0x66c
  worker_thread+0x3e8/0xa4c
  kthread+0x150/0x1b4
  ret_from_fork+0x10/0x30
  Fix this lockup by making ufshcd_exec_dev_cmd() allocate a reserved
  request.