1 files changed, 4 insertions, 0 deletions
diff --git a/src/core/SkRegion.cpp b/src/core/SkRegion.cpp
index 8ba3167297..204e35479d 100644
--- a/src/core/SkRegion.cpp
+++ b/src/core/SkRegion.cpp
@@ -145,6 +145,10 @@ bool SkRegion::setRect(const SkIRect& r) {
         return this->setEmpty();
     }
     this->freeRuns();
+    SkASSERT(r.left()   != SkRegion::kRunTypeSentinel);
+    SkASSERT(r.top()    != SkRegion::kRunTypeSentinel);
+    SkASSERT(r.right()  != SkRegion::kRunTypeSentinel);
+    SkASSERT(r.bottom() != SkRegion::kRunTypeSentinel);
     fBounds = r;
     fRunHead = SkRegion_gRectRunHeadPtr;
     return true;