int FFmpegVideoDecoder::GetVideoBuffer(AVCodecContext* codec_context,
                                       AVFrame* frame) {
  VideoFrame::Format format = PixelFormatToVideoFormat(codec_context->pix_fmt);
  if (format == VideoFrame::UNKNOWN)
    return AVERROR(EINVAL);
  DCHECK(format == VideoFrame::YV12 || format == VideoFrame::YV16 ||
          format == VideoFrame::YV12J);
 
   gfx::Size size(codec_context->width, codec_context->height);
  const int ret = av_image_check_size(size.width(), size.height(), 0, NULL);
  if (ret < 0)
     return ret;
 
   gfx::Size natural_size;
  if (codec_context->sample_aspect_ratio.num > 0) {
    natural_size = GetNaturalSize(size,
                                  codec_context->sample_aspect_ratio.num,
                                  codec_context->sample_aspect_ratio.den);
  } else {
     natural_size = config_.natural_size();
   }
 
  // FFmpeg has specific requirements on the allocation size of the frame.  The
  // following logic replicates FFmpeg's allocation strategy to ensure buffers
  // are not overread / overwritten.  See ff_init_buffer_info() for details.
  //
  // When lowres is non-zero, dimensions should be divided by 2^(lowres), but
  // since we don't use this, just DCHECK that it's zero.
  DCHECK_EQ(codec_context->lowres, 0);
  gfx::Size coded_size(std::max(size.width(), codec_context->coded_width),
                       std::max(size.height(), codec_context->coded_height));

  if (!VideoFrame::IsValidConfig(
          format, coded_size, gfx::Rect(size), natural_size))
     return AVERROR(EINVAL);
 
  scoped_refptr<VideoFrame> video_frame = frame_pool_.CreateFrame(
      format, coded_size, gfx::Rect(size), natural_size, kNoTimestamp());
 
   for (int i = 0; i < 3; i++) {
     frame->base[i] = video_frame->data(i);
    frame->data[i] = video_frame->data(i);
    frame->linesize[i] = video_frame->stride(i);
  }

   frame->opaque = NULL;
   video_frame.swap(reinterpret_cast<VideoFrame**>(&frame->opaque));
   frame->type = FF_BUFFER_TYPE_USER;
  frame->width = coded_size.width();
  frame->height = coded_size.height();
   frame->format = codec_context->pix_fmt;
 
   return 0;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.