From dadbbbdc6421fa9c009c755160ef212a2a716837 Mon Sep 17 00:00:00 2001
From: John Reiser <jreiser@BitWagon.com>
Date: Sat, 13 Aug 2022 12:25:30 -0700
Subject: [PATCH] Avoid trouble: disallow empty name of export directory

https://github.com/upx/upx/issues/425
	modified:   pefile.cpp
---
 src/pefile.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pefile.cpp b/src/pefile.cpp
index 49a438c9..ae4aef68 100644
--- a/src/pefile.cpp
+++ b/src/pefile.cpp
@@ -1143,7 +1143,7 @@ void PeFile::Export::convert(unsigned eoffs,unsigned esize)
     size = sizeof(export_dir_t);
     iv.add(eoffs,size);
 
-    if (eoffs + esize <= (unsigned)edir.name) {
+    if (!edir.name || eoffs + esize <= (unsigned)edir.name) {
         char msg[50]; snprintf(msg, sizeof(msg),
                 "bad export directory name RVA %#x", (unsigned)edir.name);
         throwInternalError(msg);