[PATCH 2/2] drm/amd/powerplay: Fix KASAN user after free on driver unload.

[Andrey Grodzovsky]

Reusing local handle to initialize BO without resetting it to
NULL is wrong since it causes amdgpu_bo_create_reserved to skip
new BO creation and just reuse the given pointer for pinning.

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
---
 drivers/gpu/drm/amd/powerplay/smumgr/rv_smumgr.c     |  7 ++-----
 drivers/gpu/drm/amd/powerplay/smumgr/vega10_smumgr.c | 16 +++++-----------
 2 files changed, 7 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/smumgr/rv_smumgr.c b/drivers/gpu/drm/amd/powerplay/smumgr/rv_smumgr.c
index e2ee23a..65c6ca7 100644
--- a/drivers/gpu/drm/amd/powerplay/smumgr/rv_smumgr.c
+++ b/drivers/gpu/drm/amd/powerplay/smumgr/rv_smumgr.c
@@ -327,7 +327,6 @@ static int rv_start_smu(struct pp_hwmgr *hwmgr)
 
 static int rv_smu_init(struct pp_hwmgr *hwmgr)
 {
-	struct amdgpu_bo *handle = NULL;
 	struct rv_smumgr *priv;
 	uint64_t mc_addr;
 	void *kaddr = NULL;
@@ -345,7 +344,7 @@ static int rv_smu_init(struct pp_hwmgr *hwmgr)
 			sizeof(Watermarks_t),
 			PAGE_SIZE,
 			AMDGPU_GEM_DOMAIN_VRAM,
-			&handle,
+			&priv->smu_tables.entry[WMTABLE].handle,
 			&mc_addr,
 			&kaddr);
 
@@ -357,14 +356,13 @@ static int rv_smu_init(struct pp_hwmgr *hwmgr)
 	priv->smu_tables.entry[WMTABLE].table_id = TABLE_WATERMARKS;
 	priv->smu_tables.entry[WMTABLE].mc_addr = mc_addr;
 	priv->smu_tables.entry[WMTABLE].table = kaddr;
-	priv->smu_tables.entry[WMTABLE].handle = handle;
 
 	/* allocate space for watermarks table */
 	r = amdgpu_bo_create_kernel((struct amdgpu_device *)hwmgr->adev,
 			sizeof(DpmClocks_t),
 			PAGE_SIZE,
 			AMDGPU_GEM_DOMAIN_VRAM,
-			&handle,
+			&priv->smu_tables.entry[CLOCKTABLE].handle,
 			&mc_addr,
 			&kaddr);
 
@@ -380,7 +378,6 @@ static int rv_smu_init(struct pp_hwmgr *hwmgr)
 	priv->smu_tables.entry[CLOCKTABLE].table_id = TABLE_DPMCLOCKS;
 	priv->smu_tables.entry[CLOCKTABLE].mc_addr = mc_addr;
 	priv->smu_tables.entry[CLOCKTABLE].table = kaddr;
-	priv->smu_tables.entry[CLOCKTABLE].handle = handle;
 
 	return 0;
 }
diff --git a/drivers/gpu/drm/amd/powerplay/smumgr/vega10_smumgr.c b/drivers/gpu/drm/amd/powerplay/smumgr/vega10_smumgr.c
index 15e1afa..c8b326e 100644
--- a/drivers/gpu/drm/amd/powerplay/smumgr/vega10_smumgr.c
+++ b/drivers/gpu/drm/amd/powerplay/smumgr/vega10_smumgr.c
@@ -377,7 +377,6 @@ static int vega10_verify_smc_interface(struct pp_hwmgr *hwmgr)
 
 static int vega10_smu_init(struct pp_hwmgr *hwmgr)
 {
-	struct amdgpu_bo *handle = NULL;
 	struct vega10_smumgr *priv;
 	uint64_t mc_addr;
 	void *kaddr = NULL;
@@ -403,7 +402,7 @@ static int vega10_smu_init(struct pp_hwmgr *hwmgr)
 			sizeof(PPTable_t),
 			PAGE_SIZE,
 			AMDGPU_GEM_DOMAIN_VRAM,
-			&handle,
+			&priv->smu_tables.entry[PPTABLE].handle,
 			&mc_addr,
 			&kaddr);
 
@@ -415,14 +414,13 @@ static int vega10_smu_init(struct pp_hwmgr *hwmgr)
 	priv->smu_tables.entry[PPTABLE].table_id = TABLE_PPTABLE;
 	priv->smu_tables.entry[PPTABLE].mc_addr = mc_addr;
 	priv->smu_tables.entry[PPTABLE].table = kaddr;
-	priv->smu_tables.entry[PPTABLE].handle = handle;
 
 	/* allocate space for watermarks table */
 	ret = amdgpu_bo_create_kernel((struct amdgpu_device *)hwmgr->adev,
 			sizeof(Watermarks_t),
 			PAGE_SIZE,
 			AMDGPU_GEM_DOMAIN_VRAM,
-			&handle,
+			&priv->smu_tables.entry[WMTABLE].handle,
 			&mc_addr,
 			&kaddr);
 
@@ -434,14 +432,13 @@ static int vega10_smu_init(struct pp_hwmgr *hwmgr)
 	priv->smu_tables.entry[WMTABLE].table_id = TABLE_WATERMARKS;
 	priv->smu_tables.entry[WMTABLE].mc_addr = mc_addr;
 	priv->smu_tables.entry[WMTABLE].table = kaddr;
-	priv->smu_tables.entry[WMTABLE].handle = handle;
 
 	/* allocate space for AVFS table */
 	ret = amdgpu_bo_create_kernel((struct amdgpu_device *)hwmgr->adev,
 			sizeof(AvfsTable_t),
 			PAGE_SIZE,
 			AMDGPU_GEM_DOMAIN_VRAM,
-			&handle,
+			&priv->smu_tables.entry[AVFSTABLE].handle,
 			&mc_addr,
 			&kaddr);
 
@@ -453,7 +450,6 @@ static int vega10_smu_init(struct pp_hwmgr *hwmgr)
 	priv->smu_tables.entry[AVFSTABLE].table_id = TABLE_AVFS;
 	priv->smu_tables.entry[AVFSTABLE].mc_addr = mc_addr;
 	priv->smu_tables.entry[AVFSTABLE].table = kaddr;
-	priv->smu_tables.entry[AVFSTABLE].handle = handle;
 
 	tools_size = 0x19000;
 	if (tools_size) {
@@ -461,7 +457,7 @@ static int vega10_smu_init(struct pp_hwmgr *hwmgr)
 				tools_size,
 				PAGE_SIZE,
 				AMDGPU_GEM_DOMAIN_VRAM,
-				&handle,
+				&priv->smu_tables.entry[TOOLSTABLE].handle,
 				&mc_addr,
 				&kaddr);
 		if (ret)
@@ -471,7 +467,6 @@ static int vega10_smu_init(struct pp_hwmgr *hwmgr)
 		priv->smu_tables.entry[TOOLSTABLE].table_id = TABLE_PMSTATUSLOG;
 		priv->smu_tables.entry[TOOLSTABLE].mc_addr = mc_addr;
 		priv->smu_tables.entry[TOOLSTABLE].table = kaddr;
-		priv->smu_tables.entry[TOOLSTABLE].handle = handle;
 	}
 
 	/* allocate space for AVFS Fuse table */
@@ -479,7 +474,7 @@ static int vega10_smu_init(struct pp_hwmgr *hwmgr)
 			sizeof(AvfsFuseOverride_t),
 			PAGE_SIZE,
 			AMDGPU_GEM_DOMAIN_VRAM,
-			&handle,
+			&priv->smu_tables.entry[AVFSFUSETABLE].handle,
 			&mc_addr,
 			&kaddr);
 	if (ret)
@@ -490,7 +485,6 @@ static int vega10_smu_init(struct pp_hwmgr *hwmgr)
 	priv->smu_tables.entry[AVFSFUSETABLE].table_id = TABLE_AVFS_FUSE_OVERRIDE;
 	priv->smu_tables.entry[AVFSFUSETABLE].mc_addr = mc_addr;
 	priv->smu_tables.entry[AVFSFUSETABLE].table = kaddr;
-	priv->smu_tables.entry[AVFSFUSETABLE].handle = handle;
 
 	return 0;
 
-- 
2.7.4