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!

kernel.org https://git.kernel.org/stable/c/4f32504a2f85a7b40fe149436881381f48e9c0c0 [No types assigned]

kernel.org https://git.kernel.org/stable/c/7b5d58c07024516c0e81b95e98f37710cf402c53 [No types assigned]