check of fScaledBitmap failed to lock

src/core/SkBitmapProcState.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkBitmapProcState.h"
 #include "SkColorPriv.h"
 #include "SkFilterProc.h"
@@ skipping 141 matching lines @@
                 // the scanline proc handle it.
                 return false;
 
             }
             fScaledCacheID = SkScaledImageCache::AddAndLock(fOrigBitmap,
                                                             invScaleX,
                                                             invScaleY,
                                                             fScaledBitmap);
         }
         fScaledBitmap.lockPixels(); // wonder if Resize() should have locked this
+        if (!fScaledBitmap.getPixels()) {
+            // TODO: find out how this can happen, and add a unittest to exercise
+            // inspired by BUG=chromium:295895
+            return false;
+        }
+
         fBitmap = &fScaledBitmap;
 
         // set the inv matrix type to translate-only;
         fInvMatrix.setTranslate(fInvMatrix.getTranslateX() / fInvMatrix.getScaleX(),
                                 fInvMatrix.getTranslateY() / fInvMatrix.getScaleY());
 
         // no need for any further filtering; we just did it!
         fFilterLevel = SkPaint::kNone_FilterLevel;
         return true;
     }
@@ skipping 796 matching lines @@
     } else {
         size >>= 2;
     }
 
     if (fFilterLevel != SkPaint::kNone_FilterLevel) {
         size >>= 1;
     }
 
     return size;
 }