VYPR
← All advisories
Unrated severityNVD Advisory· Published May 21, 2024· Updated Nov 3, 2025

drm/amdgpu: handle the case of pci_channel_io_frozen only in amdgpu_pci_resume

CVE-2021-47421

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

101

Patches

Vulnerability mechanics

References

3

News mentions

0

No linked articles in our index yet.