From b0d8b7cb8e86367178ef0c35dcae359d820c3b27 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Tue, 12 Feb 2019 23:28:35 +0100
Subject: [PATCH] avformat/mov: Do not use reference stream in mov_read_sidx()
 if there is no reference stream

Fixes: NULL pointer dereference
Fixes: clusterfuzz-testcase-minimized-audio_decoder_fuzzer-5634316373721088

Reported-by: Chris Cunningham <chcunningham@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/mov.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index 73a5ec240e..bbd588c705 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -5045,7 +5045,7 @@ static int mov_read_sidx(MOVContext *c, AVIOContext *pb, MOVAtom atom)
                 }
             }
         }
-        for (i = 0; i < c->fc->nb_streams; i++) {
+        if (ref_st) for (i = 0; i < c->fc->nb_streams; i++) {
             st = c->fc->streams[i];
             sc = st->priv_data;
             if (!sc->has_sidx) {