From a831a20910408fc7472d89cf7fa10bd479445537 Mon Sep 17 00:00:00 2001
From: John Reiser <jreiser@BitWagon.com>
Date: Sat, 4 May 2024 09:40:51 -0700
Subject: [PATCH] unpackExtent detects corrupted compression method

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=66338&q=label%3AProj-upx
	modified:   p_unix.cpp
---
 src/p_unix.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/p_unix.cpp b/src/p_unix.cpp
index 86f9bc6a..5114b7aa 100644
--- a/src/p_unix.cpp
+++ b/src/p_unix.cpp
@@ -481,7 +481,7 @@ unsigned PackUnix::unpackExtent(unsigned wanted, OutputFile *fo,
         int const sz_cpr = ph.c_len = get_te32(&hdr.sz_cpr);
         ph.filter_cto = hdr.b_cto8;
 
-        if (sz_unc == 0) { // must never happen while 0!=wanted
+        if (sz_unc == 0 || M_LZMA < hdr.b_method) {
             throwCantUnpack("corrupt b_info");
             break;
         }