drm/radeon: Fix encoder->possible_clones
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: drm/radeon: Fix encoder->possible_clones Include the encoder itself in its possible_clones bitmask. In the past nothing validated that drivers were populating possible_clones correctly, but that changed in commit 74d2aacbe840 ("drm: Validate encoder->possible_clones"). Looks like radeon never got the memo and is still not following the rules 100% correctly. This results in some warnings during driver initialization: Bogus possible_clones: [ENCODER:46:TV-46] possible_clones=0x4 (full encoder mask=0x7) WARNING: CPU: 0 PID: 170 at drivers/gpu/drm/drm_mode_config.c:615 drm_mode_config_validate+0x113/0x39c ... (cherry picked from commit 3b6e7d40649c0d75572039aff9d0911864c689db)
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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References
- https://git.kernel.org/stable/c/df75c78bfeff99f9b4815c3e79e2b1b1e34fe264
- https://git.kernel.org/stable/c/fda5dc80121b12871dc343ab37e0c3f0d138825d
- https://git.kernel.org/stable/c/c3cd27d85f0778f4ec07384d7516b33153759b8e
- https://git.kernel.org/stable/c/1a235af0216411a32ab4db54f7bd19020b46c86d
- https://git.kernel.org/stable/c/68801730ebb9393460b30cd3885e407f15da27a9
- https://git.kernel.org/stable/c/28127dba64d8ae1a0b737b973d6d029908599611
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