Fix stack overflow (#5764)

Co-authored-by: Kim Kulling <[email protected]>

code/AssetLib/LWS/LWSLoader.cpp

@@ -78,7 +78,15 @@ static constexpr aiImporterDesc desc = {
 
 // ------------------------------------------------------------------------------------------------
 // Recursive parsing of LWS files
-void LWS::Element::Parse(const char *&buffer, const char *end) {
+namespace {
+    constexpr int MAX_DEPTH = 1000; // Define the maximum depth allowed
+}
+
+void LWS::Element::Parse(const char *&buffer, const char *end, int depth) {
+    if (depth > MAX_DEPTH) {
+        throw std::runtime_error("Maximum recursion depth exceeded in LWS::Element::Parse");
+    }
+
     for (; SkipSpacesAndLineEnd(&buffer, end); SkipLine(&buffer, end)) {
 
         // begin of a new element with children
@@ -121,7 +129,7 @@ void LWS::Element::Parse(const char *&buffer, const char *end) {
 
         // parse more elements recursively
         if (sub) {
-            children.back().Parse(buffer, end);
+            children.back().Parse(buffer, end, depth + 1);
         }
     }
 }

code/AssetLib/LWS/LWSLoader.h

@@ -76,7 +76,7 @@ public:
     std::list<Element> children;
 
     //! Recursive parsing function
-    void Parse(const char *&buffer, const char *end);
+    void Parse(const char *&buffer, const char *end, int depth = 0);
 };
 
 #define AI_LWS_MASK (0xffffffff >> 4u)