From 05caadc7eedbef471ac9610809ba683f0c698700 Mon Sep 17 00:00:00 2001
From: Tim Kientzle <kientzle@acm.org>
Date: Sun, 19 Jun 2016 14:21:42 -0700
Subject: [PATCH] Issue 719:  Fix for TALOS-CAN-154

A RAR file with an invalid zero dictionary size was not being
rejected, leading to a zero-sized allocation for the dictionary
storage which was then overwritten during the dictionary initialization.

Thanks to the Open Source and Threat Intelligence project at Cisco for
reporting this.
---
 libarchive/archive_read_support_format_rar.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libarchive/archive_read_support_format_rar.c b/libarchive/archive_read_support_format_rar.c
index 6450aac..6c49f1a 100644
--- a/libarchive/archive_read_support_format_rar.c
+++ b/libarchive/archive_read_support_format_rar.c
@@ -2127,6 +2127,12 @@ parse_codes(struct archive_read *a)
       rar->range_dec.Stream = &rar->bytein;
       __archive_ppmd7_functions.Ppmd7_Construct(&rar->ppmd7_context);
 
+      if (rar->dictionary_size == 0) {
+	      archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT,
+                          "Invalid zero dictionary size");
+	      return (ARCHIVE_FATAL);
+      }
+
       if (!__archive_ppmd7_functions.Ppmd7_Alloc(&rar->ppmd7_context,
         rar->dictionary_size, &g_szalloc))
       {
-- 
2.7.4