ofz#30330 recursion too deep

Change-Id: Iaa3961cd6501f45c93bf02a42da7816d0b83097f
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/110489
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/starmath/source/parse.cxx b/starmath/source/parse.cxx
index 41a6d482cf8f..b4541fea8bb7 100644
--- a/starmath/source/parse.cxx
+++ b/starmath/source/parse.cxx
@@ -1314,6 +1314,8 @@ std::unique_ptr<SmNode> SmParser::DoSum()
 {
     DepthProtect aDepthGuard(m_nParseDepth);
 
+    int nDepthLimit = m_nParseDepth;
+
     auto xFirst = DoProduct();
     while (TokenInGroup(TG::Sum))
     {
@@ -1322,7 +1324,13 @@ std::unique_ptr<SmNode> SmParser::DoSum()
         auto xThird = DoProduct();
         xSNode->SetSubNodes(std::move(xFirst), std::move(xSecond), std::move(xThird));
         xFirst = std::move(xSNode);
+
+        ++m_nParseDepth;
+        DepthProtect bDepthGuard(m_nParseDepth);
     }
+
+    m_nParseDepth = nDepthLimit;
+
     return xFirst;
 }