From c5c66dfbf5bcb3955e7ba8a0f7fbba474683d220 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Wed, 6 Dec 2023 19:00:04 +0100
Subject: [PATCH] exslt: Fix EXSLT functions without parameters

Fix regression from commit 7364666b on platforms where malloc(0) returns
NULL.

Should fix #100.
---
 libexslt/functions.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/libexslt/functions.c b/libexslt/functions.c
index 9497d7e0..56f1dbdb 100644
--- a/libexslt/functions.c
+++ b/libexslt/functions.c
@@ -385,13 +385,15 @@ exsltFuncFunctionFunction (xmlXPathParserContextPtr ctxt, int nargs) {
     newBase = tctxt->varsNr;
     /* If there are any parameters */
     if (paramNode != NULL) {
-        args = (xmlXPathObjectPtr *) xmlMalloc(sizeof(*args) * nargs);
-        if (args == NULL)
-            goto error;
-        /* Fetch the stored argument values from the caller */
-	for (i = nargs - 1; i >= 0; i--) {
-            args[i] = valuePop(ctxt);
-	}
+        if (nargs > 0) {
+            args = (xmlXPathObjectPtr *) xmlMalloc(sizeof(*args) * nargs);
+            if (args == NULL)
+                goto error;
+            /* Fetch the stored argument values from the caller */
+            for (i = nargs - 1; i >= 0; i--) {
+                args[i] = valuePop(ctxt);
+            }
+        }
 
 	/*
 	 * Prepare to process params in reverse order.  First, go to