drm/amdgpu: Fix variable 'mca_funcs' dereferenced before NULL check in 'amdgpu_mca_smu_get_mca_entry()'

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

drm/amdgpu: Fix variable 'mca_funcs' dereferenced before NULL check in 'amdgpu_mca_smu_get_mca_entry()'

Fixes the below:

drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c:377 amdgpu_mca_smu_get_mca_entry() warn: variable dereferenced before check 'mca_funcs' (see line 368)

357 int amdgpu_mca_smu_get_mca_entry(struct amdgpu_device *adev,

enum amdgpu_mca_error_type type,

358 int idx, struct mca_bank_entry *entry)

359 {

360 const struct amdgpu_mca_smu_funcs *mca_funcs =

adev->mca.mca_funcs;

361 int count;

362

363 switch (type) {

364 case AMDGPU_MCA_ERROR_TYPE_UE:

365 count = mca_funcs->max_ue_count;

mca_funcs is dereferenced here.

366 break;

367 case AMDGPU_MCA_ERROR_TYPE_CE:

368 count = mca_funcs->max_ce_count;

mca_funcs is dereferenced here.

369 break;

370 default:

371 return -EINVAL;

372 }

373

374 if (idx >= count)

375 return -EINVAL;

376

377 if (mca_funcs && mca_funcs->mca_get_mca_entry)

^^^^^^^^^

Checked too late!