Make sure buffers are large enough to hold the Result structure.

gpu/command_buffer/service/common_decoder.cc

Index: gpu/command_buffer/service/common_decoder.cc
diff --git a/gpu/command_buffer/service/common_decoder.cc b/gpu/command_buffer/service/common_decoder.cc
index b879f9572d3848dbfc06253653c12f5c6b861b45..a561056e3542bd7afd19df4c1c9af89f9bb4d2de 100644
--- a/gpu/command_buffer/service/common_decoder.cc
+++ b/gpu/command_buffer/service/common_decoder.cc
@@ -143,10 +143,11 @@ void* CommonDecoder::GetAddressAndCheckSize(unsigned int shm_id,
 
 void* CommonDecoder::GetAddressAndSize(unsigned int shm_id,
                                        unsigned int data_offset,
+                                       unsigned int minimum_size,
                                        unsigned int* data_size) {
   CHECK(engine_);
   scoped_refptr<gpu::Buffer> buffer = engine_->GetSharedMemoryBuffer(shm_id);
-  if (!buffer.get())
+  if (!buffer.get() || buffer->GetRemainingSize(data_offset) < minimum_size)
     return NULL;
   return buffer->GetDataAddressAndSize(data_offset, data_size);
 }