From c046890191628b607e479e4845d48acc9c879143 Mon Sep 17 00:00:00 2001
From: Luca Barbato <lu_zero@gentoo.org>
Date: Sat, 20 Apr 2013 13:36:44 +0200
Subject: [PATCH] riff: check for eof if chunk size and code are 0

Prevent an infinite loop.

Inspired by a patch from Michael Niedermayer

CC: libav-stable@libav.org

Signed-off-by: Diego Biurrun <diego@biurrun.de>
(cherry picked from commit 8e329dba378cef0ff6400c7df9c51da167d5a1f0)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
---
 libavformat/riff.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/riff.c b/libavformat/riff.c
index 79b2670481..e9463c0973 100644
--- a/libavformat/riff.c
+++ b/libavformat/riff.c
@@ -728,6 +728,10 @@ int ff_read_riff_info(AVFormatContext *s, int64_t size)
         if (!chunk_code) {
             if (chunk_size)
                 avio_skip(pb, chunk_size);
+            else if (pb->eof_reached) {
+                av_log(s, AV_LOG_WARNING, "truncated file\n");
+                return AVERROR_EOF;
+            }
             continue;
         }