From: Srinivasan Shanmugam Date: Wed, 3 Jan 2024 16:35:16 +0000 (+0530) Subject: drm/amdgpu: Fix variable 'mca_funcs' dereferenced before NULL check in 'amdgpu_mca_sm... X-Git-Tag: v6.7.4~126 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=7b5d58c07024516c0e81b95e98f37710cf402c53;p=thirdparty%2Fkernel%2Fstable.git drm/amdgpu: Fix variable 'mca_funcs' dereferenced before NULL check in 'amdgpu_mca_smu_get_mca_entry()' [ Upstream commit 4f32504a2f85a7b40fe149436881381f48e9c0c0 ] 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 Cc: Hawking Zhang Cc: Christian König Cc: Alex Deucher Signed-off-by: Srinivasan Shanmugam Reviewed-by: Yang Wang Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c index cf33eb219e257..061d88f4480d7 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mca.c @@ -351,6 +351,9 @@ 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; @@ -365,10 +368,7 @@ 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) - return mca_funcs->mca_get_mca_entry(adev, type, idx, entry); - - return -EOPNOTSUPP; + return mca_funcs->mca_get_mca_entry(adev, type, idx, entry); } #if defined(CONFIG_DEBUG_FS)