CVE-2021-47412 (GCVE-0-2021-47412)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:04 – Updated: 2025-12-18 11:37
VLAI?
Title
block: don't call rq_qos_ops->done_bio if the bio isn't tracked
Summary
In the Linux kernel, the following vulnerability has been resolved: block: don't call rq_qos_ops->done_bio if the bio isn't tracked rq_qos framework is only applied on request based driver, so: 1) rq_qos_done_bio() needn't to be called for bio based driver 2) rq_qos_done_bio() needn't to be called for bio which isn't tracked, such as bios ended from error handling code. Especially in bio_endio(): 1) request queue is referred via bio->bi_bdev->bd_disk->queue, which may be gone since request queue refcount may not be held in above two cases 2) q->rq_qos may be freed in blk_cleanup_queue() when calling into __rq_qos_done_bio() Fix the potential kernel panic by not calling rq_qos_ops->done_bio if the bio isn't tracked. This way is safe because both ioc_rqos_done_bio() and blkcg_iolatency_done_bio() are nop if the bio isn't tracked.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578 , < db60edbfff332a6a5477c367af8125f034570989 (git)
Affected: 67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578 , < 004b8f8a691205a93d9e80d98b786b2b97424d6e (git)
Affected: 67b42d0bf7a8fd1ec0cf1acdc9550e688d7c8578 , < a647a524a46736786c95cdb553a070322ca096e3 (git)
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    Linux Linux Affected: 4.19
Unaffected: 0 , < 4.19 (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.14.11 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
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