In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: check if hubbub is NULL in debugfs/amdgpu_dm_capabilities HUBBUB structure is not initialized on DCE hardware, so check if it is NULL to avoid null dereference while accessing amdgpu_dm_capabilities file in debugfs.
https://git.kernel.org/stable/c/b4a69f7f29c8a459ad6b4d8a8b72450f1d9fd288
https://git.kernel.org/stable/c/98e92fceb9507901e3e8b550e93b843306abd354
https://git.kernel.org/stable/c/83cfdc2b018cd9c0f927b781d4e07c0d4a911fac