CVE-2024-56695

In the Linux kernel, the following vulnerability has been resolved:

drm/amdkfd: Use dynamic allocation for CU occupancy array in 'kfdgetcu_occupancy()'

The kfd_get_cu_occupancy function previously declared a large cu_occupancy array as a local variable, which could lead to stack overflows due to excessive stack usage. This commit replaces the static array allocation with dynamic memory allocation using kcalloc, thereby reducing the stack size.

This change avoids the risk of stack overflows in kernel space, in scenarios where AMDGPU_MAX_QUEUES is large. The allocated memory is freed using kfree before the function returns to prevent memory leaks.

Fixes the below with gcc W=1: drivers/gpu/drm/amd/amdgpu/../amdkfd/kfdprocess.c: In function ‘kfdgetcuoccupancy’: drivers/gpu/drm/amd/amdgpu/../amdkfd/kfd_process.c:322:1: warning: the frame size of 1056 bytes is larger than 1024 bytes [-Wframe-larger-than=] 322 | } | ^