cve-2021-47421
Vulnerability from cvelistv5
Published
2024-05-21 15:04
Modified
2024-12-19 07:41
Severity ?
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dc
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/248b061689a40f4fed05252ee2c89f87cf26d7d8
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/72e9a1bf9b722628c28092e0c2cd8717edd201dc
Impacted products
Vendor Product Version
Linux Linux Version: c9a6b82f45e261d247b980a7949aaa6a9bfffe01
Version: c9a6b82f45e261d247b980a7949aaa6a9bfffe01
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   Linux Linux Version: 5.10
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