SvgLoader: Prevent underflow when stack.cnt is 0

If graphic node is directly located in the <svg>(root) node,
it may cause underflow because stack.cnt is 0.

Change-Id: I04b8aac9354cb33a9e7b5d277e6681fbcecce975

diff --git a/src/loaders/svg/tvgSvgLoader.cpp b/src/loaders/svg/tvgSvgLoader.cpp
index d6334f528314b6b65aef5d4dcaee46aace2e8ae6..093fe4722685ea28080fd93937ae7ff20fe79a00 100644 (file)
--- a/src/loaders/svg/tvgSvgLoader.cpp
+++ b/src/loaders/svg/tvgSvgLoader.cpp
@@ -1963,7 +1963,8 @@ static void _svgLoaderParserXmlOpen(SvgLoaderData* loader, const char* content,
             loader->stack.push(node);
         }
     } else if ((method = _findGraphicsFactory(tagName))) {
-        parent = loader->stack.list[loader->stack.cnt - 1];
+        if (loader->stack.cnt > 0) parent = loader->stack.list[loader->stack.cnt - 1];
+        else parent = loader->doc;
         node = method(loader, parent, attrs, attrsLength);
     } else if ((gradientMethod = _findGradientFactory(tagName))) {
         SvgStyleGradient* gradient;