From ec8a4841f7e81040f9a2757f23e70dff5e6b33a4 Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <cehoyos@ag.or.at>
Date: Mon, 2 Sep 2013 08:32:24 +0200
Subject: [PATCH] Avoid a deadlock when decoding wma.

Fixes ticket #2925.
---
 libavcodec/wmadec.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavcodec/wmadec.c b/libavcodec/wmadec.c
index d46eb33c41..8fc0cca807 100644
--- a/libavcodec/wmadec.c
+++ b/libavcodec/wmadec.c
@@ -512,6 +512,10 @@ static int wma_decode_block(WMACodecContext *s)
        coef escape coding */
     total_gain = 1;
     for(;;) {
+        if (get_bits_left(&s->gb) < 7) {
+            av_log(s->avctx, AV_LOG_ERROR, "total_gain overread\n");
+            return AVERROR_INVALIDDATA;
+        }
         a = get_bits(&s->gb, 7);
         total_gain += a;
         if (a != 127)