From d7d37c479fa71639650751648275615e979beb33 Mon Sep 17 00:00:00 2001
From: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Date: Mon, 4 Jan 2016 12:57:38 +0100
Subject: [PATCH] brstm: make sure an ADPC chunk was read for adpcm_thp

This fixes NULL pointer dereferencing.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
---
 libavformat/brstm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/brstm.c b/libavformat/brstm.c
index bbdbcef6cb..6ec4d89438 100644
--- a/libavformat/brstm.c
+++ b/libavformat/brstm.c
@@ -389,6 +389,11 @@ static int read_packet(AVFormatContext *s, AVPacket *pkt)
         codec->codec_id == AV_CODEC_ID_ADPCM_THP_LE) {
         uint8_t *dst;
 
+        if (!b->adpc) {
+            av_log(s, AV_LOG_ERROR, "adpcm_thp requires ADPC chunk, but none was found.\n");
+            return AVERROR_INVALIDDATA;
+        }
+
         if (size > (INT_MAX - 32 - 4) ||
             (32 + 4 + size) > (INT_MAX / codec->channels) ||
             (32 + 4 + size) * codec->channels > INT_MAX - 8)