From 6cb44a44b9eda6b321ccdbf6483348d4a9798b00 Mon Sep 17 00:00:00 2001
From: Mans Rullgard <mans@mansr.com>
Date: Sun, 5 Nov 2017 16:43:35 +0000
Subject: [PATCH] hcom: fix crash on input with corrupt dictionary
 (CVE-2017-11358)

---
 src/hcom.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/hcom.c b/src/hcom.c
index c62b020c..1b0e09dd 100644
--- a/src/hcom.c
+++ b/src/hcom.c
@@ -150,6 +150,11 @@ static int startread(sox_format_t * ft)
                 lsx_debug("%d %d",
                        p->dictionary[i].dict_leftson,
                        p->dictionary[i].dict_rightson);
+                if ((unsigned) p->dictionary[i].dict_leftson >= dictsize ||
+                    (unsigned) p->dictionary[i].dict_rightson >= dictsize) {
+                        lsx_fail_errno(ft, SOX_EHDR, "Invalid dictionary");
+                        return SOX_EOF;
+                }
         }
         rc = lsx_skipbytes(ft, (size_t) 1); /* skip pad byte */
         if (rc)