File libmspack-fix-bounds-checking.patch of Package libmspack.20475

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File libmspack-fix-bounds-checking.patch of Package libmspack.20475

From 72e70a921f0f07fee748aec2274b30784e1d312a Mon Sep 17 00:00:00 2001
From: Stuart Caie <kyzer@cabextract.org.uk>
Date: Sat, 12 May 2018 10:51:34 +0100
Subject: [PATCH] Fix off-by-one bounds check on CHM PMGI/PMGL chunk numbers and reject empty filenames. Thanks to Hanno Böck for reporting
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---
 libmspack/ChangeLog     | 10 ++++++++++
 libmspack/mspack/chmd.c |  9 ++++++---
 2 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/mspack/chmd.c b/mspack/chmd.c
index c921c8c..9c32658 100644
--- a/mspack/chmd.c
+++ b/mspack/chmd.c
@@ -1,5 +1,5 @@
 /* This file is part of libmspack.
- * (C) 2003-2011 Stuart Caie.
+ * (C) 2003-2018 Stuart Caie.
  *
  * libmspack is free software; you can redistribute it and/or modify it under
  * the terms of the GNU Lesser General Public License (LGPL) version 2.1
@@ -397,7 +397,7 @@ static int chmd_read_headers(struct mspack_system *sys, struct mspack_file *fh,
     D(("first pmgl chunk is after last pmgl chunk"))
     return MSPACK_ERR_DATAFORMAT;
   }
-  if (chm->index_root != 0xFFFFFFFF && chm->index_root > chm->num_chunks) {
+  if (chm->index_root != 0xFFFFFFFF && chm->index_root >= chm->num_chunks) {
     D(("index_root outside valid range"))
     return MSPACK_ERR_DATAFORMAT;
   }
@@ -622,7 +625,7 @@ static unsigned char *read_chunk(struct mschm_decompressor_p *self,
     unsigned char *buf;
 
     /* check arguments - most are already checked by chmd_fast_find */
-    if (chunk_num > chm->num_chunks) return NULL;
+    if (chunk_num >= chm->num_chunks) return NULL;
     
     /* ensure chunk cache is available */
     if (!chm->chunk_cache) {

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File libmspack-fix-bounds-checking.patch of Package libmspack.20475

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