convolution.cpp.diff

diff --git a/torch/csrc/autograd/functions/convolution.cpp b/torch/csrc/autograd/functions/convolution.cpp
index 465283c..991648c 100644
--- a/torch/csrc/autograd/functions/convolution.cpp
+++ b/torch/csrc/autograd/functions/convolution.cpp
@@ -578,6 +578,16 @@ auto ConvBackwardBackward::apply(const variable_list& grad_grad_inputs) -> varia
     gI = Transpose(0, 1).apply({gIt})[0];
   }
 
+  auto zeros_like = [](const Variable& var) -> std::shared_ptr<Variable> {
+    auto data = var.data->newTensor();
+    data->resizeAs(*var.data).zero();
+    return std::make_shared<Variable>(std::move(data), false, false);
+  };
+
+  if (should_compute_output(0) && !ggO) ggO = zeros_like(*gO);
+  if (should_compute_output(1) && !gI) gI = zeros_like(*input);
+  if (should_compute_output(2) && !gW) gW = zeros_like(*weight);
+
   return {ggO, gI, gW};
 }