Refcount all the IFX_ stream classes all the time.

testing/libfuzzer/xfa_codec_fuzzer.h

 // Copyright 2016 The PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef TESTING_LIBFUZZER_XFA_CODEC_FUZZER_H_
 #define TESTING_LIBFUZZER_XFA_CODEC_FUZZER_H_
 
 #include <memory>
 
 #include "core/fxcodec/codec/ccodec_progressivedecoder.h"
 #include "core/fxcodec/fx_codec.h"
 #include "core/fxcrt/fx_stream.h"
 
 class XFACodecFuzzer {
  public:
   static int Fuzz(const uint8_t* data, size_t size, FXCODEC_IMAGE_TYPE type) {
     std::unique_ptr<CCodec_ModuleMgr> mgr(new CCodec_ModuleMgr());
     std::unique_ptr<CCodec_ProgressiveDecoder> decoder(
         mgr->CreateProgressiveDecoder());
-    Reader source(data, size);
-
-    FXCODEC_STATUS status =
-        decoder->LoadImageInfo(&source, type, nullptr, true);
+    CFX_RetainPtr<Reader> source(new Reader(data, size));
+    FXCODEC_STATUS status = decoder->LoadImageInfo(source, type, nullptr, true);
     if (status != FXCODEC_STATUS_FRAME_READY)
       return 0;
 
     std::unique_ptr<CFX_DIBitmap> bitmap(new CFX_DIBitmap);
     bitmap->Create(decoder->GetWidth(), decoder->GetHeight(), FXDIB_Argb);
 
     int32_t frames;
     if (decoder->GetFrames(frames) != FXCODEC_STATUS_DECODE_READY ||
         frames == 0)
       return 0;
 
     status = decoder->StartDecode(bitmap.get(), 0, 0, bitmap->GetWidth(),
                                   bitmap->GetHeight());
     while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE)
       status = decoder->ContinueDecode();
 
     return 0;
   }
 
  private:
   class Reader : public IFX_SeekableReadStream {
    public:
     Reader(const uint8_t* data, size_t size) : m_data(data), m_size(size) {}
     ~Reader() {}
 
-    void Release() override {}
-
     bool ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override {
       if (offset < 0 || static_cast<size_t>(offset) >= m_size)
         return false;
       if (offset + size > m_size)
         size = m_size - offset;
       if (size == 0)
         return false;
 
       memcpy(buffer, m_data + offset, size);
       return true;
     }
 
     FX_FILESIZE GetSize() override { return static_cast<FX_FILESIZE>(m_size); }
 
    private:
     const uint8_t* const m_data;
     size_t m_size;
   };
 };
 
 #endif  // TESTING_LIBFUZZER_XFA_CODEC_FUZZER_H_