From b87f60a9172929947fb2c43c00a3d932f62bb95e Mon Sep 17 00:00:00 2001
From: John Reiser <jreiser@BitWagon.com>
Date: Wed, 10 Jan 2024 15:31:37 -0800
Subject: [PATCH] Check Mach_fat_arch.align

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=65558
https://github.com/upx/upx/issues/765
	modified:   p_mach.cpp
---
 src/p_mach.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/p_mach.cpp b/src/p_mach.cpp
index ad005d3e..8c35ad28 100644
--- a/src/p_mach.cpp
+++ b/src/p_mach.cpp
@@ -2267,6 +2267,11 @@ unsigned PackMachFat::check_fat_head()
     }
     for (unsigned j=0; j < nfat; ++j) {
         unsigned const align = arch[j].align;
+        if (24 < align) {
+            char msg[80]; snprintf(msg, sizeof(msg),
+                "bad fat_arch alignment 0x%x > 24", align);
+            throwCantPack(msg);
+        }
         unsigned const mask = ~(~0u<<align);
         unsigned const size = arch[j].size;
         unsigned const offset = arch[j].offset;