drm/i915/guc: Clear pointers on free

Clear out some pointers when objects have been de-allocated. This makes it much easier to track down use-after-free type issues. Signed-off-by: John Harrison <John.C.Harrison@Intel.com> Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20201028145826.2949180-4-John.C.Harrison@Intel.com
mariux64 · Oct 29, 2020 · 0f41e31 · 0f41e31
1 parent 164e57c
commit 0f41e31
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diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
@@ -220,6 +220,7 @@ int intel_guc_ads_create(struct intel_guc *guc)
 void intel_guc_ads_destroy(struct intel_guc *guc)
 {
 	i915_vma_unpin_and_release(&guc->ads_vma, I915_VMA_RELEASE_MAP);
+	guc->ads_blob = NULL;
 }
 
 static void guc_ads_private_data_reset(struct intel_guc *guc)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ct.c
@@ -210,6 +210,7 @@ void intel_guc_ct_fini(struct intel_guc_ct *ct)
 	GEM_BUG_ON(ct->enabled);
 
 	i915_vma_unpin_and_release(&ct->vma, I915_VMA_RELEASE_MAP);
+	memset(ct, 0, sizeof(*ct));
 }
 
 /**