From: Helmut Grohne <helmut@subdivi.de>
Date: Sat, 11 Nov 2023 18:18:40 +0100
Subject: hcom: validate dictsize

Bug: https://sourceforge.net/p/sox/bugs/350/
Bug: https://sourceforge.net/p/sox/bugs/352/
Bug-Debian: https://bugs.debian.org/1021133
Bug-Debian: https://bugs.debian.org/1021134

This patch fixes both CVE-2021-23159 and CVE-2021-23172.
---
 src/hcom.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/hcom.c b/src/hcom.c
index 84643a2..7e3bd1a 100644
--- a/src/hcom.c
+++ b/src/hcom.c
@@ -141,6 +141,11 @@ static int startread(sox_format_t * ft)
                 return (SOX_EOF);
         }
         lsx_readw(ft, &dictsize);
+        if (dictsize == 0 || dictsize > 511)
+        {
+                lsx_fail_errno(ft, SOX_EHDR, "Implausible dictionary size in HCOM header");
+                return SOX_EOF;
+        }
 
         /* Translate to sox parameters */
         ft->encoding.encoding = SOX_ENCODING_HCOM;
