From c2657633187e325a439e3297fd9ccd0522ab2e39 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Thu, 4 Jun 2015 22:59:34 +0200
Subject: [PATCH] avcodec/alsdec: Check for overread

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/alsdec.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index 75be55cc1e..b7d147d681 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -1493,6 +1493,11 @@ static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
 
     // TODO: read_diff_float_data
 
+    if (get_bits_left(gb) < 0) {
+        av_log(ctx->avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
+        return AVERROR_INVALIDDATA;
+    }
+
     return 0;
 }