Bug 2347999 (CVE-2022-49720)

Summary: CVE-2022-49720 kernel: block: Fix handling of offline queues in blk_mq_alloc_request_hctx()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-02-26 03:14:07 UTC 
In the Linux kernel, the following vulnerability has been resolved:

block: Fix handling of offline queues in blk_mq_alloc_request_hctx()

This patch prevents that test nvme/004 triggers the following:

UBSAN: array-index-out-of-bounds in block/blk-mq.h:135:9
index 512 is out of range for type 'long unsigned int [512]'
Call Trace:
 show_stack+0x52/0x58
 dump_stack_lvl+0x49/0x5e
 dump_stack+0x10/0x12
 ubsan_epilogue+0x9/0x3b
 __ubsan_handle_out_of_bounds.cold+0x44/0x49
 blk_mq_alloc_request_hctx+0x304/0x310
 __nvme_submit_sync_cmd+0x70/0x200 [nvme_core]
 nvmf_connect_io_queue+0x23e/0x2a0 [nvme_fabrics]
 nvme_loop_connect_io_queues+0x8d/0xb0 [nvme_loop]
 nvme_loop_create_ctrl+0x58e/0x7d0 [nvme_loop]
 nvmf_create_ctrl+0x1d7/0x4d0 [nvme_fabrics]
 nvmf_dev_write+0xae/0x111 [nvme_fabrics]
 vfs_write+0x144/0x560
 ksys_write+0xb7/0x140
 __x64_sys_write+0x42/0x50
 do_syscall_64+0x35/0x80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
Comment 1 Avinash Hanwate 2025-02-26 18:53:32 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022632-CVE-2022-49720-b0a8@gregkh/T