From d615985b8a1b68bbdc0f31e0e6e648f93c434095 Mon Sep 17 00:00:00 2001
From: John Reiser <jreiser@BitWagon.com>
Date: Thu, 18 Jan 2024 19:11:12 -0800
Subject: [PATCH] elf_find_table_size() did not check for empty table

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=65765&q=label%3AProj-upx
https://github.com/upx/upx/issues/771
	modified:   p_lx_elf.cpp
---
 src/p_lx_elf.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/p_lx_elf.cpp b/src/p_lx_elf.cpp
index 52a84efd..c7541ab7 100644
--- a/src/p_lx_elf.cpp
+++ b/src/p_lx_elf.cpp
@@ -2046,6 +2046,9 @@ unsigned PackLinuxElf32::elf_find_table_size(unsigned dt_type, unsigned sh_type)
     unsigned x_rva;
     if (dt_type < DT_NUM) {
         unsigned const x_ndx = dt_table[dt_type];
+        if (!x_ndx) { // no such entry
+            return 0;
+        }
         x_rva = get_te32(&dynseg[-1+ x_ndx].d_val);
     }
     else {
@@ -7935,6 +7938,9 @@ unsigned PackLinuxElf64::elf_find_table_size(unsigned dt_type, unsigned sh_type)
     unsigned x_rva;
     if (dt_type < DT_NUM) {
         unsigned const x_ndx = dt_table[dt_type];
+        if (!x_ndx) { // no such entry
+            return 0;
+        }
         x_rva = get_te64(&dynseg[-1+ x_ndx].d_val);
     }
     else {