Prevent a potential OOB read in TranslateImageLine.

core/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp

Index: core/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
diff --git a/core/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp b/core/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
index 951d38359f6b3bfcb2dfe0c6f3c85727d8898811..52a6f817f525440b07634f21f1b303399d3d2075 100644
--- a/core/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
+++ b/core/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
@@ -570,9 +570,12 @@ int CPDF_DIBSource::CreateDecoder() {
                                 bpc, bTransform)) {
         if (m_nComponents != static_cast<uint32_t>(comps)) {
           FX_Free(m_pCompData);
+          m_pCompData = nullptr;
           m_nComponents = static_cast<uint32_t>(comps);
+          if (m_pColorSpace &&
+              m_pColorSpace->CountComponents() != m_nComponents)
+            return 0;
           if (m_Family == PDFCS_LAB && m_nComponents != 3) {

[Tom Sepez, 2016/04/15 20:14:49]

nit: no {}

[Oliver Chang, 2016/04/15 20:40:26]

Done.

-            m_pCompData = nullptr;
             return 0;
           }
           m_pCompData = GetDecodeAndMaskArray(m_bDefaultDecode, m_bColorKey);