CVE-2021-47421 (GCVE-0-2021-47421)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:04 – Updated: 2025-11-03 17:30
VLAI?
Title
drm/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume In current code, when a PCI error state pci_channel_io_normal is detectd, it will report PCI_ERS_RESULT_CAN_RECOVER status to PCI driver, and PCI driver will continue the execution of PCI resume callback report_resume by pci_walk_bridge, and the callback will go into amdgpu_pci_resume finally, where write lock is releasd unconditionally without acquiring such lock first. In this case, a deadlock will happen when other threads start to acquire the read lock. To fix this, add a member in amdgpu_device strucutre to cache pci_channel_state, and only continue the execution in amdgpu_pci_resume when it's pci_channel_io_frozen.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c9a6b82f45e261d247b980a7949aaa6a9bfffe01 , < 785cc093b6b5a93cc350421a55f3f1eda6585156 (git)
Affected: c9a6b82f45e261d247b980a7949aaa6a9bfffe01 , < 72e9a1bf9b722628c28092e0c2cd8717edd201dc (git)
Affected: c9a6b82f45e261d247b980a7949aaa6a9bfffe01 , < 248b061689a40f4fed05252ee2c89f87cf26d7d8 (git)
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    Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.14.12 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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