Initial error handling code

src/core/SkImageFilter.cpp

Index: src/core/SkImageFilter.cpp
diff --git a/src/core/SkImageFilter.cpp b/src/core/SkImageFilter.cpp
index c8c0c4dbf8257000d8eaa9bb07cf788a6730849d..704d01a22c19bab5f7f68e9876e82ebb6b0e61ca 100644
--- a/src/core/SkImageFilter.cpp
+++ b/src/core/SkImageFilter.cpp
@@ -10,6 +10,7 @@
 #include "SkBitmap.h"
 #include "SkFlattenableBuffers.h"
 #include "SkRect.h"
+#include "SkValidationUtils.h"
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #include "GrTexture.h"
@@ -75,9 +76,15 @@ SkImageFilter::SkImageFilter(SkFlattenableReadBuffer& buffer)
     }
 #ifdef SK_CROP_RECT_IS_INT
     buffer.readIRect(&fCropRect);
+    // Do not use SkIsValidRect() here, since width() and height() are allowed
+    // to be larger than SK_MaxS32 in this specific case. Check inversion instead.
+    buffer.validate(!fCropRect.isInverted());
 #else
     buffer.readRect(&fCropRect.fRect);
     fCropRect.fFlags = buffer.readUInt();
+    // Do not use SkIsValidRect() here, since width() and height() are allowed
+    // to be larger than SK_MaxS32 in this specific case. Check inversion instead.
+    buffer.validate(!fCropRect.fRect.isInverted());
 #endif
 }