Fix bnupdate_eltwise_eltwise ub fusion pass

mindspore/ccsrc/backend/optimizer/ascend/buffer_fusion/bnupdate_eltwise_eltwise_fusion_pass.cc

@@ -27,6 +27,20 @@
 
 namespace mindspore {
 namespace opt {
+namespace {
+constexpr size_t kEltwiseInputSize = 2;
+constexpr size_t kEltwiseOutputSize = 2;
+bool CheckEltwiseInputAndOutputSize(const AnfNodePtr &node) {
+  if (AnfAlgo::GetInputTensorNum(node) == kEltwiseInputSize) {
+    return true;
+  }
+  if (AnfAlgo::GetOutputTensorNum(node) == kEltwiseOutputSize) {
+    return true;
+  }
+  return false;
+}
+}  // namespace
+
 void BnupdateEltwiseEltwiseFusionPass::MatchBnupdateAddRelu(const CNodePtr &cnode, const AnfNodePtr &relu_input,
                                                             const session::KernelGraph &kernel_graph,
                                                             FusedNodeRecord *candidate_fusion) {
@@ -74,8 +88,9 @@ void BnupdateEltwiseEltwiseFusionPass::MatchSingleFusionPattern(const session::K
     auto cnode = node->cast<CNodePtr>();
     MS_EXCEPTION_IF_NULL(cnode);
     if (AnfAlgo::GetKernelType(cnode) == KernelType::TBE_KERNEL &&
-        AnfAlgo::GetFusionType(cnode) == kernel::FusionType::ELEMWISE) {
+        AnfAlgo::GetFusionType(cnode) == kernel::FusionType::ELEMWISE && CheckEltwiseInputAndOutputSize(cnode)) {
       auto eltwise_input = cnode->input(1);
+      MS_EXCEPTION_IF_NULL(eltwise_input);
       if (eltwise_input->isa<CNode>() && AnfAlgo::CheckPrimitiveType(eltwise_input, prim::kPrimTensorAdd)) {
         MatchBnupdateAddRelu(cnode, eltwise_input, kernel_graph, candidate_fusion);
       }