diff --git a/src/gpu/geometry/GrQuad.h b/src/gpu/geometry/GrQuad.h
index 9a080f3..ea3cdec 100644
--- a/src/gpu/geometry/GrQuad.h
+++ b/src/gpu/geometry/GrQuad.h
@@ -100,6 +100,18 @@
         return {min(x), min(y), max(x), max(y)};
     }
 
+    bool isFinite() const {
+        // If any coordinate is infinity or NaN, then multiplying it with 0 will make accum NaN
+        float accum = 0;
+        for (int i = 0; i < 4; ++i) {
+            accum *= fX[i];
+            accum *= fY[i];
+            accum *= fW[i];
+        }
+        SkASSERT(0 == accum || SkScalarIsNaN(accum));
+        return !SkScalarIsNaN(accum);
+    }
+
     float x(int i) const { return fX[i]; }
     float y(int i) const { return fY[i]; }
     float w(int i) const { return fW[i]; }
diff --git a/src/gpu/geometry/GrQuadUtils.cpp b/src/gpu/geometry/GrQuadUtils.cpp
index fce38d2..c4e86d7 100644
--- a/src/gpu/geometry/GrQuadUtils.cpp
+++ b/src/gpu/geometry/GrQuadUtils.cpp
@@ -198,6 +198,8 @@
 
 bool CropToRect(const SkRect& cropRect, GrAA cropAA, GrQuadAAFlags* edgeFlags, GrQuad* quad,
                 GrQuad* local) {
+    SkASSERT(quad->isFinite());
+
     if (quad->quadType() == GrQuad::Type::kAxisAligned) {
         // crop_rect keeps the rectangles as rectangles, so there's no need to modify types
         if (local) {
diff --git a/src/gpu/geometry/GrQuadUtils.h b/src/gpu/geometry/GrQuadUtils.h
index 5f6d283..53b53d2 100644
--- a/src/gpu/geometry/GrQuadUtils.h
+++ b/src/gpu/geometry/GrQuadUtils.h
@@ -25,7 +25,7 @@
      * Crops quad to the provided device-space axis-aligned rectangle. If the intersection of this
      * quad (projected) and cropRect results in a quadrilateral, this returns true. If not, this
      * quad may be updated to be a smaller quad of the same type such that its intersection with
-     * cropRect is visually the same.
+     * cropRect is visually the same. This function assumes that the 'quad' coordinates are finite.
      *
      * The provided edge flags are updated to reflect edges clipped by cropRect (toggling on or off
      * based on cropAA policy). If provided, the local coordinates will be updated to reflect the