package/sox: add fix for CVE-2021-3643 CVE-2021-23210

This fix is included in Debian's sox package. The CVE is not reported
by pkg-stats because the NVD database has associated it to the
sox_project:sox vendor/product CPE. This has been reported to NVD:

  https://lore.kernel.org/buildroot/20250517220322.4da9bdb3@windsurf/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/sox/0006-voc-word-width-should-never-be-0-to-avoid-division-b.patch

@@ -0,0 +1,34 @@
+From ad8ecfbdd9ff184b60600a115247a6aa947d0215 Mon Sep 17 00:00:00 2001
+From: Helmut Grohne <helmut@subdivi.de>
+Date: Sat, 17 May 2025 22:10:00 +0200
+Subject: [PATCH] voc: word width should never be 0 to avoid division by zero
+
+Bug: https://sourceforge.net/p/sox/bugs/351/
+Bug-Debian: https://bugs.debian.org/1010374
+
+This patch fixes both CVE-2021-3643 and CVE-2021-23210.
+
+Upstream: https://sourceforge.net/p/sox/bugs/351/
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
+---
+ src/voc.c | 4 ++++
+ 1 file changed, 4 insertions(+)
+
+diff --git a/src/voc.c b/src/voc.c
+index a75639e9..0ca07f94 100644
+--- a/src/voc.c
++++ b/src/voc.c
+@@ -625,6 +625,10 @@ static int getblock(sox_format_t * ft)
+         v->rate = new_rate_32;
+         ft->signal.rate = new_rate_32;
+         lsx_readb(ft, &uc);
++        if (uc <= 1) {
++          lsx_fail_errno(ft, SOX_EFMT, "2 bits per word required");
++          return (SOX_EOF);
++        }
+         v->size = uc;
+         lsx_readb(ft, &uc);
+         if (v->channels != -1 && uc != v->channels) {
+-- 
+2.49.0
+

package/sox/sox.mk

@@ -59,6 +59,11 @@ SOX_IGNORE_CVES += CVE-2019-8357
 # sox-14.4.2-44-g7b6a8892
 SOX_IGNORE_CVES += CVE-2019-13590
 
+# 0006-voc-word-width-should-never-be-0-to-avoid-division-b.patch
+# This entry is NOT stale, those CVEs are not reported by pkg-stats
+# due to the change of CPE ID to sox_project:sox in the NVD database
+SOX_IGNORE_CVES += CVE-2021-3643 CVE-2021-23210
+
 SOX_CONF_OPTS = \
 	--with-distro="Buildroot" \
 	--disable-stack-protector