Fix crash when rendering invalid GIF

The core fix in this CL is a change to how LWZ decompression works, so
that when the min code table size and the color palette size are
different, color codes after the end of the defined color palette are
considered errors.

This CL also introduces a bunch of tweaks to the call return path,
since there were multiple locations where the GIF decode failing
status was being dropped on the floor, so the end widget would have a
bitmap with the default colour in it, instead of nothing.

BUG=chromium:616671

Change-Id: Id6f40d552dc24650c91e9903f710ff2fa63bc774
Reviewed-on: https://pdfium-review.googlesource.com/14630
Commit-Queue: Ryan Harrison <rharrison@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

1 files changed, 32 insertions, 6 deletions

diff --git a/xfa/fxfa/cxfa_ffwidget.cpp b/xfa/fxfa/cxfa_ffwidget.cpp
index 7763a19972..859287388f 100644
--- a/xfa/fxfa/cxfa_ffwidget.cpp
+++ b/xfa/fxfa/cxfa_ffwidget.cpp
@@ -899,6 +899,17 @@ void XFA_DrawBox(CXFA_Box box,
   XFA_BOX_Stroke(box, strokes, pGS, rtWidget, matrix, dwFlags);
 }
 
+bool IsFXCodecErrorStatus(FXCODEC_STATUS status) {
+  return (status == FXCODEC_STATUS_ERROR ||
+#ifdef PDF_ENABLE_XFA
+          status == FXCODEC_STATUS_ERR_MEMORY ||
+#endif  // PDF_ENABLE_XFA
+          status == FXCODEC_STATUS_ERR_READ ||
+          status == FXCODEC_STATUS_ERR_FLUSH ||
+          status == FXCODEC_STATUS_ERR_FORMAT ||
+          status == FXCODEC_STATUS_ERR_PARAMS);
+}
+
 }  // namespace
 
 CXFA_FFWidget::CXFA_FFWidget(CXFA_WidgetAcc* pDataAcc)
@@ -2001,14 +2012,29 @@ RetainPtr<CFX_DIBitmap> XFA_LoadImageFromBuffer(
   pBitmap->Create(pProgressiveDecoder->GetWidth(),
                   pProgressiveDecoder->GetHeight(), dibFormat);
   pBitmap->Clear(0xffffffff);
+
   int32_t nFrames;
-  if ((pProgressiveDecoder->GetFrames(nFrames) ==
-       FXCODEC_STATUS_DECODE_READY) &&
-      (nFrames > 0)) {
-    pProgressiveDecoder->StartDecode(pBitmap, 0, 0, pBitmap->GetWidth(),
-                                     pBitmap->GetHeight());
-    pProgressiveDecoder->ContinueDecode();
+  if (pProgressiveDecoder->GetFrames(&nFrames) != FXCODEC_STATUS_DECODE_READY ||
+      nFrames <= 0) {
+    pBitmap = nullptr;
+    return pBitmap;
+  }
+
+  FXCODEC_STATUS status = pProgressiveDecoder->StartDecode(
+      pBitmap, 0, 0, pBitmap->GetWidth(), pBitmap->GetHeight());
+  if (IsFXCodecErrorStatus(status)) {
+    pBitmap = nullptr;
+    return pBitmap;
   }
+
+  while (status == FXCODEC_STATUS_DECODE_TOBECONTINUE) {
+    status = pProgressiveDecoder->ContinueDecode();
+    if (IsFXCodecErrorStatus(status)) {
+      pBitmap = nullptr;
+      return pBitmap;
+    }
+  }
+
   return pBitmap;
 }