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From 05caadc7eedbef471ac9610809ba683f0c698700 Mon Sep 17 00:00:00 2001
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From: Tim Kientzle <kientzle@acm.org>
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Date: Sun, 19 Jun 2016 14:21:42 -0700
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Subject: [PATCH] Issue 719: Fix for TALOS-CAN-154
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A RAR file with an invalid zero dictionary size was not being
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rejected, leading to a zero-sized allocation for the dictionary
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storage which was then overwritten during the dictionary initialization.
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Thanks to the Open Source and Threat Intelligence project at Cisco for
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reporting this.
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---
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libarchive/archive_read_support_format_rar.c | 6 ++++++
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1 file changed, 6 insertions(+)
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diff --git a/libarchive/archive_read_support_format_rar.c b/libarchive/archive_read_support_format_rar.c
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index 6450aac..6c49f1a 100644
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--- a/libarchive/archive_read_support_format_rar.c
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+++ b/libarchive/archive_read_support_format_rar.c
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@@ -2127,6 +2127,12 @@ parse_codes(struct archive_read *a)
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rar->range_dec.Stream = &rar->bytein;
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__archive_ppmd7_functions.Ppmd7_Construct(&rar->ppmd7_context);
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+ if (rar->dictionary_size == 0) {
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+ archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
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+ "Invalid zero dictionary size");
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+ return (ARCHIVE_FATAL);
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+ }
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+
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if (!__archive_ppmd7_functions.Ppmd7_Alloc(&rar->ppmd7_context,
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rar->dictionary_size, &g_szalloc))
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{
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--
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2.7.4
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