From 31f7eb6d370d1ca5ec70a6143bf3d6bc2863f254 Mon Sep 17 00:00:00 2001
From: Stuart Caie <kyzer@cabextract.org.uk>
Date: Wed, 17 Oct 2018 11:29:03 +0100
Subject: [PATCH 4/6] Avoid returning CHM file entries that are "blank" because
 they have embedded null bytes

(cherry picked from commit 8759da8db6ec9e866cb8eb143313f397f925bb4f)
---
 libmspack/trunk/mspack/chmd.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libmspack/trunk/mspack/chmd.c b/libmspack/trunk/mspack/chmd.c
index cea9fc2..beaccb7 100644
--- a/libmspack/trunk/mspack/chmd.c
+++ b/libmspack/trunk/mspack/chmd.c
@@ -447,14 +447,14 @@ static int chmd_read_headers(struct mspack_system *sys, struct mspack_file *fh,
     while (num_entries--) {
       READ_ENCINT(name_len);
       if (name_len > (unsigned int) (end - p)) goto chunk_end;
-      /* consider blank filenames to be an error */
-      if (name_len == 0) goto chunk_end;
       name = p; p += name_len;
-
       READ_ENCINT(section);
       READ_ENCINT(offset);
       READ_ENCINT(length);
 
+      /* ignore blank or one-char (e.g. "/") filenames we'd return as blank */
+      if (name_len < 2 || !name[0] || !name[1]) continue;
+
       /* empty files and directory names are stored as a file entry at
        * offset 0 with length 0. We want to keep empty files, but not
        * directory names, which end with a "/" */
-- 
2.22.0