Prevent a potential OOB read in TranslateImageLine.
Fixes a potential mismatch of |m_nComponents| between CPDF_DIBSource and
its CPDF_ColorSpace, from code attempting to recover from a failed decoder
initialisation in CPDF_DIBSource::CreateDecoder.
BUG=chromium:603518
R=tsepez@chromium.org
Review URL: https://codereview.chromium.org/1892143003
diff --git a/core/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp b/core/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
index 951d383..44ac29f 100644
--- a/core/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
+++ b/core/fpdfapi/fpdf_render/fpdf_render_loadimage.cpp
@@ -570,15 +570,16 @@
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_Family == PDFCS_LAB && m_nComponents != 3) {
- m_pCompData = nullptr;
+ if (m_pColorSpace &&
+ m_pColorSpace->CountComponents() != m_nComponents)
return 0;
- }
+ if (m_Family == PDFCS_LAB && m_nComponents != 3)
+ return 0;
m_pCompData = GetDecodeAndMaskArray(m_bDefaultDecode, m_bColorKey);
- if (!m_pCompData) {
+ if (!m_pCompData)
return 0;
- }
}
m_bpc = bpc;
m_pDecoder.reset(CPDF_ModuleMgr::Get()->GetJpegModule()->CreateDecoder(
diff --git a/core/fpdfapi/fpdf_render/fpdf_render_loadimage_embeddertest.cpp b/core/fpdfapi/fpdf_render/fpdf_render_loadimage_embeddertest.cpp
index 427abb8..5c6a8c5 100644
--- a/core/fpdfapi/fpdf_render/fpdf_render_loadimage_embeddertest.cpp
+++ b/core/fpdfapi/fpdf_render/fpdf_render_loadimage_embeddertest.cpp
@@ -27,3 +27,13 @@
FPDFBitmap_Destroy(bitmap);
UnloadPage(page);
}
+
+TEST_F(FPDFRenderLoadImageEmbeddertest, Bug_603518) {
+ // Should not crash
+ EXPECT_TRUE(OpenDocument("bug_603518.pdf"));
+ FPDF_PAGE page = LoadPage(0);
+ EXPECT_NE(nullptr, page);
+ FPDF_BITMAP bitmap = RenderPage(page);
+ FPDFBitmap_Destroy(bitmap);
+ UnloadPage(page);
+}
diff --git a/testing/resources/bug_603518.pdf b/testing/resources/bug_603518.pdf
new file mode 100644
index 0000000..1af6005
--- /dev/null
+++ b/testing/resources/bug_603518.pdf
Binary files differ