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From e31767785bc0922a953bbd1ef6428bf319ba2d2b Mon Sep 17 00:00:00 2001
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From: Stuart Caie <kyzer@cabextract.org.uk>
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Date: Wed, 17 Oct 2018 11:33:35 +0100
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Subject: [PATCH 2/3] CAB block input buffer is one byte too small for maximal
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Quantum block
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(cherry picked from commit 40ef1b4093d77ad3a5cfcee1f5cb6108b3a3bcc2)
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---
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libmspack/mspack/cab.h | 12 ++++++++++--
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1 file changed, 10 insertions(+), 2 deletions(-)
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diff --git a/libmspack/mspack/cab.h b/libmspack/mspack/cab.h
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index 59cf95e..25cebcb 100644
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--- a/libmspack/mspack/cab.h
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+++ b/libmspack/mspack/cab.h
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@@ -1,5 +1,5 @@
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/* This file is part of libmspack.
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- * (C) 2003-2004 Stuart Caie.
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+ * (C) 2003-2018 Stuart Caie.
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*
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* libmspack is free software; you can redistribute it and/or modify it under
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* the terms of the GNU Lesser General Public License (LGPL) version 2.1
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@@ -70,6 +70,14 @@
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#define CAB_BLOCKMAX (32768)
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#define CAB_INPUTMAX (CAB_BLOCKMAX+6144)
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+/* input buffer needs to be CAB_INPUTMAX + 1 byte to allow for max-sized block
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+ * plus 1 trailer byte added by cabd_sys_read_block() for Quantum alignment.
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+ *
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+ * When MSCABD_PARAM_SALVAGE is set, block size is not checked so can be
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+ * up to 65535 bytes, so max input buffer size needed is 65535 + 1
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+ */
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+#define CAB_INPUTBUF (65535 + 1)
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+
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/* There are no more than 65535 data blocks per folder, so a folder cannot
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* be more than 32768*65535 bytes in length. As files cannot span more than
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* one folder, this is also their max offset, length and offset+length limit.
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@@ -100,7 +108,7 @@ struct mscabd_decompress_state {
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struct mspack_file *infh; /* input file handle */
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struct mspack_file *outfh; /* output file handle */
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unsigned char *i_ptr, *i_end; /* input data consumed, end */
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- unsigned char input[CAB_INPUTMAX]; /* one input block of data */
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+ unsigned char input[CAB_INPUTBUF]; /* one input block of data */
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};
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struct mscab_decompressor_p {
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--
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2.22.0
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