diff --git a/src/objects.c b/src/objects.c
index d0f97f04..e4519fa1 100644
--- a/src/objects.c
+++ b/src/objects.c
@@ -2762,7 +2762,7 @@ static CK_RV return_dup_key(P11PROV_OBJ *dst, P11PROV_OBJ *src)
     dst->cka_token = src->cka_token;
     dst->data.key = src->data.key;
 
-    dst->attrs = OPENSSL_malloc(sizeof(CK_ATTRIBUTE) * src->numattrs);
+    dst->attrs = OPENSSL_zalloc(sizeof(CK_ATTRIBUTE) * src->numattrs);
     if (!dst->attrs) {
         rv = CKR_HOST_MEMORY;
         P11PROV_raise(dst->ctx, rv, "Failed allocation");
diff --git a/src/util.c b/src/util.c
index 59f52796..a6140f8f 100644
--- a/src/util.c
+++ b/src/util.c
@@ -1016,8 +1016,10 @@ CK_RV p11prov_copy_attr(CK_ATTRIBUTE *dst, CK_ATTRIBUTE *src)
             return CKR_HOST_MEMORY;
         }
         memcpy(dst->pValue, src->pValue, src->ulValueLen);
-        dst->ulValueLen = src->ulValueLen;
+    } else {
+        dst->pValue = NULL;
     }
+    dst->ulValueLen = src->ulValueLen;
     dst->type = src->type;
 
     return CKR_OK;