Fix #14884 fuzzing timeout (hang) in TemplateSimplifier::expandTemplate() (#8691)

Author: chrchr-github

lib/templatesimplifier.cpp

@@ -170,8 +170,12 @@ TemplateSimplifier::TokenAndName::TokenAndName(Token *token, std::string scope,
                 if (isFunction())
                     tok1 = tok1->link()->next();
                 while (tok1 && !Token::Match(tok1, ";|{")) {
-                    if (tok1->str() == "<")
-                        tok1 = tok1->findClosingBracket();
+                    if (tok1->str() == "<") {
+                        if (const Token* closing = tok1->findClosingBracket())
+                            tok1 = closing;
+                        else
+                            syntaxError(tok1);
+                    }
                     else if (Token::Match(tok1, "(|[") && tok1->link())
                         tok1 = tok1->link();
                     if (tok1)

test/cli/fuzz-timeout/timeout-5225c0e6e895cdd05a15c388547d13a78a2574e2

@@ -0,0 +1 @@
+template<t>struct e<j><;