Moved misplaced allDataReceived() assert

Source/platform/image-decoders/jpeg/JPEGImageDecoder.cpp

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * Portions are Copyright (C) 2001-6 mozilla.org
  *
  * Other contributors:
  *   Stuart Parmenter <stuart@mozilla.com>
  *
  * Copyright (C) 2007-2009 Torch Mobile, Inc.
  *
@@ skipping 245 matching lines @@
 {
     int h = info->cur_comp_info[0]->h_samp_factor;
     int v = info->cur_comp_info[0]->v_samp_factor;
     return IntSize((info->output_width + h - 1) / h, (info->output_height + v - 1) / v);
 }
 
 static yuv_subsampling yuvSubsampling(const jpeg_decompress_struct& info)
 {
     if ((DCTSIZE == 8)
         && (info.num_components == 3)
+        && (info.comps_in_scan >= info.num_components)
         && (info.scale_denom <= 8)
+        && (info.cur_comp_info[0])
+        && (info.cur_comp_info[1])
+        && (info.cur_comp_info[2])
         && (info.cur_comp_info[1]->h_samp_factor == 1)
         && (info.cur_comp_info[1]->v_samp_factor == 1)
         && (info.cur_comp_info[2]->h_samp_factor == 1)
         && (info.cur_comp_info[2]->v_samp_factor == 1)) {
         int h = info.cur_comp_info[0]->h_samp_factor;
         int v = info.cur_comp_info[0]->v_samp_factor;
         // 4:4:4 : (h == 1) && (v == 1)
         // 4:4:0 : (h == 1) && (v == 2)
         // 4:2:2 : (h == 2) && (v == 1)
         // 4:2:0 : (h == 2) && (v == 2)
@@ skipping 720 matching lines @@
     // has failed.
     if (!m_reader->decode(*m_data, onlySize) && isAllDataReceived())
         setFailed();
     // If we're done decoding the image, we don't need the JPEGImageReader
     // anymore.  (If we failed, |m_reader| has already been cleared.)
     else if ((!m_frameBufferCache.isEmpty() && (m_frameBufferCache[0].status() == ImageFrame::FrameComplete)) || (hasImagePlanes() && !onlySize))
         m_reader.clear();
 }
 
 }