Add safe FX_Alloc2D() macro

core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp

Index: core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
diff --git a/core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp b/core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
index 2d7e1aeb93add6b400ddb1e910591312dc75515f..f9eec23f7a1a2f077de9f22491f43a34642bb3ff 100644
--- a/core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
+++ b/core/src/fpdfapi/fpdf_render/fpdf_render_pattern.cpp
@@ -422,7 +422,7 @@ static void _DrawLatticeGouraudShading(CFX_DIBitmap* pBitmap, CFX_AffineMatrix*
     if (!stream.Load(pShadingStream, pFuncs, nFuncs, pCS)) {
         return;
     }
-    CPDF_MeshVertex* vertex = FX_Alloc(CPDF_MeshVertex, row_verts * 2);
+    CPDF_MeshVertex* vertex = FX_Alloc2D(CPDF_MeshVertex, row_verts, 2);
     if (!stream.GetVertexRow(vertex, row_verts, pObject2Bitmap)) {
         FX_Free(vertex);
         return;