speex: fix CVE-2020-23903

Backport patch to fix CVE-2020-23903.

CVE: CVE-2020-23903

(From OE-Core rev: b8f56e5e9eef32c1e01742f913e205d93548de1f)

Signed-off-by: Kai Kang <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-multimedia/speex/speex/CVE-2020-23903.patch

@@ -0,0 +1,30 @@
+Backport patch to fix CVE-2020-23903.
+
+CVE: CVE-2020-23903
+Upstream-Status: Backport [https://github.com/xiph/speex/commit/870ff84]
+
+Signed-off-by: Kai Kang <kai.kang@windriver.com>
+
+From 870ff845b32f314aec0036641ffe18aba4916887 Mon Sep 17 00:00:00 2001
+From: Tristan Matthews <tmatth@videolan.org>
+Date: Mon, 13 Jul 2020 23:25:03 -0400
+Subject: [PATCH] wav_io: guard against invalid channel numbers
+
+Fixes #13
+---
+ src/wav_io.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/wav_io.c b/src/wav_io.c
+index b5183015..09d62eb0 100644
+--- a/src/wav_io.c
++++ b/src/wav_io.c
+@@ -111,7 +111,7 @@ int read_wav_header(FILE *file, int *rate, int *channels, int *format, spx_int32
+    stmp = le_short(stmp);
+    *channels = stmp;
+ 
+-   if (stmp>2)
++   if (stmp>2 || stmp<1)
+    {
+       fprintf (stderr, "Only mono and (intensity) stereo supported\n");
+       return -1;

meta/recipes-multimedia/speex/speex_1.2.0.bb

@@ -7,7 +7,9 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=314649d8ba9dd7045dfb6683f298d0a8 \
                     file://include/speex/speex.h;beginline=1;endline=34;md5=ef8c8ea4f7198d71cf3509c6ed05ea50"
 DEPENDS = "libogg speexdsp"
 
-SRC_URI = "http://downloads.xiph.org/releases/speex/speex-${PV}.tar.gz"
+SRC_URI = "http://downloads.xiph.org/releases/speex/speex-${PV}.tar.gz \
+           file://CVE-2020-23903.patch \
+           "
 UPSTREAM_CHECK_REGEX = "speex-(?P<pver>\d+(\.\d+)+)\.tar"
 
 SRC_URI[md5sum] = "8ab7bb2589110dfaf0ed7fa7757dc49c"