From 63dbf6b3b9e6e781df1a6a64e609b10e23969681 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Wed, 15 Apr 2026 12:00:17 -0700
Subject: gzip: don’t mishandle .lzh after .Z
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Problem reported by Michał Majchrowicz.
* unlzh.c (read_c_len): Clear left and right when n == 0.
---
 NEWS    | 4 ++++
 THANKS  | 1 +
 unlzh.c | 6 ++++++
 3 files changed, 11 insertions(+)

diff --git a/unlzh.c b/unlzh.c
index 2522764..c3e92ff 100644
--- a/unlzh.c
+++ b/unlzh.c
@@ -313,6 +307,12 @@ decode_p ()
 static void
 huf_decode_start ()
 {
+    /* Needed in case LEFT and RIGHT are reused from a previous
+       LZW decompression.  It may be overkill to clear all of both
+       arrays, but nobody has had time to analyze this carefully.  */
+    memzero (left, (2 * NC - 1) * sizeof *left);
+    memzero (right, (2 * NC - 1) * sizeof *right);
+
     init_getbits();  blocksize = 0;
 }
 
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