From 14607c0707040d775e06b6817325640cb4b5864c Mon Sep 17 00:00:00 2001
From: Amit Patankar <amitpatankar@google.com>
Date: Wed, 5 May 2021 21:09:21 -0700
Subject: [PATCH] Fix nullptr deref in `tf.raw_ops.CTCLoss`.

PiperOrigin-RevId: 372266334
Change-Id: Ic52c3e9f13a38f54482d670907eda1688450862b
---
 tensorflow/core/kernels/ctc_loss_op.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tensorflow/core/kernels/ctc_loss_op.cc b/tensorflow/core/kernels/ctc_loss_op.cc
index b0e298a0f329f..ca505e1db9314 100644
--- a/tensorflow/core/kernels/ctc_loss_op.cc
+++ b/tensorflow/core/kernels/ctc_loss_op.cc
@@ -109,6 +109,9 @@ class CTCLossOp : public OpKernel {
 
     const TensorShape& inputs_shape = inputs->shape();
     const int64 max_time = inputs_shape.dim_size(0);
+    OP_REQUIRES(ctx, max_time != 0,
+                errors::InvalidArgument(
+                    "Max time or first dimension of input cannot be 0."));
     const int64 batch_size = inputs_shape.dim_size(1);
     const int64 num_classes_raw = inputs_shape.dim_size(2);
     OP_REQUIRES(