libxslt update

third_party/libxslt/libexslt/functions.c

Index: third_party/libxslt/libexslt/functions.c
===================================================================
--- third_party/libxslt/libexslt/functions.c	(revision 39981)
+++ third_party/libxslt/libexslt/functions.c	(working copy)
@@ -57,6 +57,8 @@
 				       int nargs);
 static exsltFuncFunctionData *exsltFuncNewFunctionData(void);
 
+#define MAX_FUNC_RECURSION 1000
+
 /*static const xmlChar *exsltResultDataID = (const xmlChar *) "EXSLT Result";*/
 
 /**
@@ -321,6 +323,15 @@
 			 "param == NULL\n");
 	return;
     }
+    if (tctxt->funcLevel > MAX_FUNC_RECURSION) {
+	xsltGenericError(xsltGenericErrorContext,
+			 "{%s}%s: detected a recursion\n",
+			 ctxt->context->functionURI, ctxt->context->function);
+	ctxt->error = XPATH_MEMORY_ERROR;
+	return;
+    }
+    tctxt->funcLevel++;
+
     /*
      * We have a problem with the evaluation of function parameters.
      * The original library code did not evaluate XPath expressions until
@@ -437,6 +448,7 @@
     * the calling process exits.
     */
     xsltExtensionInstructionResultFinalize(tctxt);
+    tctxt->funcLevel--;
 }