Add index check for embedding kernel

kernels/quantized/cpu/op_embedding.cpp

@@ -153,6 +153,22 @@ void embedding_byte_per_channel(
 
   for (int i = 0; i < indices.numel(); i++) {
     int64_t index = indices_ptr[i];
+
+    // Check if index is out of bounds for both weight and weight_scales
+    ET_CHECK_MSG(
+        index >= 0 && index < weight.size(0),
+        "Index out of bounds for weight: index %" PRId64
+        " must be in range [0, %zd)",
+        index,
+        weight.size(0));
+
+    ET_CHECK_MSG(
+        index >= 0 && index < weight_scales.size(0),
+        "Index out of bounds for weight_scales: index %" PRId64
+        " must be in range [0, %zd)",
+        index,
+        weight_scales.size(0));
+
     // If using groupwise embedding
     int32_t qparams_index = index * num_groups_per_channel;
     CTYPE_PARAMS zp = 0.0;

kernels/quantized/test/op_embedding_test.cpp

@@ -373,3 +373,38 @@ TEST(OpQuantizedEmbeddingTest, TestGroupWiseQuantizedEmbeddingDeath5) {
           out),
       "");
 }
+
+TEST(OpQuantizedEmbeddingTest, TestOutOfBoundsIndex) {
+  et_pal_init();
+  TensorFactory<ScalarType::Float> tf;
+  TensorFactory<ScalarType::Long> tf_l;
+
+  int64_t quant_min = 0;
+  int64_t quant_max = 255;
+
+  // Create a weight tensor with 3 rows
+  TensorFactory<ScalarType::Byte> tfo;
+  Tensor qweight =
+      tfo.make({3, 4}, {8, 10, 12, 14, 10, 12, 12, 14, 8, 9, 10, 12});
+
+  // Create weight_scales with the same number of rows
+  Tensor weight_scales = tf.make({3, 1}, {0.5, 1.0, 1.5});
+  Tensor weight_zero_points = tf.make({3, 1}, {1, 5, 7});
+
+  // Create indices with an out-of-bounds index (3, which is >= weight.size(0))
+  Tensor indices = tf_l.make({2}, {1, 3});
+
+  Tensor out = tf.zeros({2, 4});
+
+  // Expect death when accessing an out-of-bounds index
+  ET_EXPECT_DEATH(
+      quantized_embedding_byte_out(
+          qweight,
+          weight_scales,
+          weight_zero_points,
+          quant_min,
+          quant_max,
+          indices,
+          out),
+      "Index out of bounds for weight");
+}