Fix Out-of-bounds read warning in drm/amd/pm

CVE-2024-46731

What is CVE-2024-46731?

A vulnerability exists in the Linux kernel's handling of AMD graphics drivers, which may lead to out-of-bounds read issues under specific conditions. The problem arises from the use of an invalid index, specifically when handling the mc_data[] array. When the index i equals 0, an attempt to access an element at i - 1U could result in reading memory outside the intended range. This defect poses a risk in environments where the kernel interacts with AMD graphics hardware, potentially leading to unauthorized memory access or application crashes. Comprehensive updates and patches are provided to mitigate this issue, ensuring safer operations and enhanced integrity of Linux systems utilizing AMD graphics.

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