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

[Srinivasan Shanmugam]

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!

Cc: Yang Wang <kevinyang.w...@amd.com>
Cc: Hawking Zhang <hawking.zh...@amd.com>
Cc: Christian König <christian.koe...@amd.com>
Cc: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmu...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c
index 8911310f98df..18790d5c96c7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c
@@ -360,6 +360,9 @@ int amdgpu_mca_smu_get_mca_entry(struct amdgpu_device 
*adev, enum amdgpu_mca_err
        const struct amdgpu_mca_smu_funcs *mca_funcs = adev->mca.mca_funcs;
        int count;
 
+       if (!mca_funcs || !mca_funcs->mca_get_mca_entry)
+               return -EOPNOTSUPP;
+
        switch (type) {
        case AMDGPU_MCA_ERROR_TYPE_UE:
                count = mca_funcs->max_ue_count;
@@ -374,7 +377,7 @@ int amdgpu_mca_smu_get_mca_entry(struct amdgpu_device 
*adev, enum amdgpu_mca_err
        if (idx >= count)
                return -EINVAL;
 
-       if (mca_funcs && mca_funcs->mca_get_mca_entry)
+       if (mca_funcs->mca_get_mca_entry)
                return mca_funcs->mca_get_mca_entry(adev, type, idx, entry);
 
        return -EOPNOTSUPP;
-- 
2.34.1