From 77ddf5ae49b5cedbd1892070b0f75ff31a19c3a6 Mon Sep 17 00:00:00 2001
From: Piotr Bandurski <ami_stuff@o2.pl>
Date: Tue, 13 Aug 2013 23:09:24 +0200
Subject: [PATCH] avcodec/gsmdec: reject unsupported msn audio modes

---
 libavcodec/gsmdec.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/libavcodec/gsmdec.c b/libavcodec/gsmdec.c
index dc64267..5de6da4 100644
--- a/libavcodec/gsmdec.c
+++ b/libavcodec/gsmdec.c
@@ -34,6 +34,14 @@
 
 static av_cold int gsm_init(AVCodecContext *avctx)
 {
+    if (avctx->codec_tag == 0x0032 &&
+        avctx->bit_rate != 13000 &&
+        avctx->bit_rate != 17912 &&
+        avctx->bit_rate != 35824 &&
+        avctx->bit_rate != 71656) {
+        av_log(avctx, AV_LOG_ERROR, "Unsupported audio mode\n");
+        return AVERROR_PATCHWELCOME;
+    }
     avctx->channels       = 1;
     avctx->channel_layout = AV_CH_LAYOUT_MONO;
     if (!avctx->sample_rate)
-- 
1.7.9