From 2545182c294ff6b91ad36a575246788159e39f28 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Tue, 14 Jan 2014 20:53:42 +0100
Subject: [PATCH] avcodec/mpegaudiodec_template/mp3on4: check that all channels
 have been decoded before returnig a frame

Fixes use of uninitialized memory
Fixes: msan_uninit-mem_7f80bf9a259e_5774_id5_1.mp4
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/mpegaudiodec_template.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/mpegaudiodec_template.c b/libavcodec/mpegaudiodec_template.c
index be8ce6d56e..f5031925ed 100644
--- a/libavcodec/mpegaudiodec_template.c
+++ b/libavcodec/mpegaudiodec_template.c
@@ -1962,6 +1962,10 @@ static int decode_frame_mp3on4(AVCodecContext *avctx, void *data,
 
         avctx->bit_rate += m->bit_rate;
     }
+    if (ch != avctx->channels) {
+        av_log(avctx, AV_LOG_ERROR, "failed to decode all channels\n");
+        return AVERROR_INVALIDDATA;
+    }
 
     /* update codec info */
     avctx->sample_rate = s->mp3decctx[0]->sample_rate;