CVE-2022-49536

scsi: lpfc: Fix SCSI I/O completion and abort handler deadlock

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix SCSI I/O completion and abort handler deadlock During stress I/O tests with 500+ vports, hard LOCKUP call traces are observed. CPU A: native_queued_spin_lock_slowpath+0x192 _raw_spin_lock_irqsave+0x32 lpfc_handle_fcp_err+0x4c6 lpfc_fcp_io_cmd_wqe_cmpl+0x964 lpfc_sli4_fp_handle_cqe+0x266 __lpfc_sli4_process_cq+0x105 __lpfc_sli4_hba_process_cq+0x3c lpfc_cq_poll_hdler+0x16 irq_poll_softirq+0x76 __softirqentry_text_start+0xe4 irq_exit+0xf7 do_IRQ+0x7f CPU B: native_queued_spin_lock_slowpath+0x5b _raw_spin_lock+0x1c lpfc_abort_handler+0x13e scmd_eh_abort_handler+0x85 process_one_work+0x1a7 worker_thread+0x30 kthread+0x112 ret_from_fork+0x1f Diagram of lockup: CPUA CPUB ---- ---- lpfc_cmd->buf_lock phba->hbalock lpfc_cmd->buf_lock phba->hbalock Fix by reordering the taking of the lpfc_cmd->buf_lock and phba->hbalock in lpfc_abort_handler routine so that it tries to take the lpfc_cmd->buf_lock first before phba->hbalock.

Category

5.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.02%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/7625e81de2164a082810e1f27547d388406da610 patch
https://git.kernel.org/stable/c/21c0d469349957b5dc811c41200a2a998996ca8d patch
https://git.kernel.org/stable/c/0c4eed901285b9cae36a622f32bea3e92490da6c patch
https://git.kernel.org/stable/c/03cbbd7c2f5ee288f648f4aeedc765a181188553 patch

Frequently Asked Questions

What is the severity of CVE-2022-49536?
CVE-2022-49536 has been scored as a medium severity vulnerability.
How to fix CVE-2022-49536?
To fix CVE-2022-49536, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-49536 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2022-49536 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-49536?
CVE-2022-49536 affects Linux Linux, Linux Linux.
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