diff --git a/ffmpeg-4.changes b/ffmpeg-4.changes
index 5039d09..02de233 100644
--- a/ffmpeg-4.changes
+++ b/ffmpeg-4.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Fri Aug 27 07:09:15 UTC 2021 - Alynx Zhou <alynx.zhou@suse.com>
+
+- Add ffmpeg-CVE-2021-38171.patch: Backport from upstream to fix
+  adts_decode_extradata in libavformat/adtsenc.c in FFmpeg 4.4
+  does not check the init_get_bits return value (bsc#1189724).
+
 -------------------------------------------------------------------
 Tue Aug 10 09:38:39 UTC 2021 - Alynx Zhou <alynx.zhou@suse.com>
 
diff --git a/ffmpeg-4.spec b/ffmpeg-4.spec
index 503a1a2..212041c 100644
--- a/ffmpeg-4.spec
+++ b/ffmpeg-4.spec
@@ -120,6 +120,7 @@ Patch8:         vmaf-trim-usr-local.patch
 Patch9:         ffmpeg-4.4-CVE-2020-22046.patch
 Patch10:        ffmpeg-CVE-2021-33815.patch
 Patch11:        ffmpeg-CVE-2021-38114.patch
+Patch12:        ffmpeg-CVE-2021-38171.patch
 BuildRequires:  ladspa-devel
 BuildRequires:  libgsm-devel
 BuildRequires:  libmp3lame-devel
diff --git a/ffmpeg-CVE-2021-38171.patch b/ffmpeg-CVE-2021-38171.patch
new file mode 100644
index 0000000..3473379
--- /dev/null
+++ b/ffmpeg-CVE-2021-38171.patch
@@ -0,0 +1,36 @@
+From 9ffa49496d1aae4cbbb387aac28a9e061a6ab0a6 Mon Sep 17 00:00:00 2001
+From: maryam ebrahimzadeh <me22bee@outlook.com>
+Date: Wed, 4 Aug 2021 16:15:18 -0400
+Subject: [PATCH] avformat/adtsenc: return value check for init_get_bits in
+ adts_decode_extradata
+
+As the second argument for init_get_bits (buf) can be crafted, a return value check for this function call is necessary.
+'buf' is  part of  'AVPacket pkt'.
+replace init_get_bits with init_get_bits8.
+
+Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
+---
+ libavformat/adtsenc.c | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+diff --git a/libavformat/adtsenc.c b/libavformat/adtsenc.c
+index ba15c0a724..3924e678d9 100644
+--- a/libavformat/adtsenc.c
++++ b/libavformat/adtsenc.c
+@@ -53,9 +53,11 @@ static int adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, const ui
+     GetBitContext gb;
+     PutBitContext pb;
+     MPEG4AudioConfig m4ac;
+-    int off;
++    int off, ret;
+ 
+-    init_get_bits(&gb, buf, size * 8);
++    ret = init_get_bits8(&gb, buf, size);
++    if (ret < 0)
++        return ret;
+     off = avpriv_mpeg4audio_get_config2(&m4ac, buf, size, 1, s);
+     if (off < 0)
+         return off;
+-- 
+2.33.0
+