Riskcovery

CVE-2021-47622

scsi: ufs: Fix a deadlock in the error handler

State
Published
Severity
Not scored
Published
Jul 16, 2024
Updated
May 23, 2026
Reserved
Jul 16, 2024

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 7252a3603015f1fd04363956f4b72a537c9f9c42 to before 493c9e850677df8b4eda150c2364b1c1a72ed724Affected
  • 7252a3603015f1fd04363956f4b72a537c9f9c42 to before d69d98d8edf90e25e4e09930dd36dd6d09dd6768Affected
  • 7252a3603015f1fd04363956f4b72a537c9f9c42 to before 945c3cca05d78351bba29fa65d93834cb7934c7bAffected
  • a8d2d45c70c7391386baf7863674f156da56a3d5Affected
  • 5.4.112 to before 5.5Affected
LinuxLinux
  • 5.6Affected
  • before 5.6Not affected
  • 5.15.25 through 5.15.*Not affected
  • 5.16.11 through 5.16.*Not affected
  • 5.17 and laterNot affected

References

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