From c86490c49a3d0683b2f63338430a369c174e2bd5 Mon Sep 17 00:00:00 2001
From: Nikolas Bowe <nbowe-at-google.com@ffmpeg.org>
Date: Fri, 2 Feb 2018 15:11:04 -0800
Subject: [PATCH] avfilter/af_join: Fix crash in join filter

Previously if ff_outlink_frame_wanted() returned 0 it could dereference a null pointer when trying to read nb_samples.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavfilter/af_join.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavfilter/af_join.c b/libavfilter/af_join.c
index cf5131e8dc..4f86e13558 100644
--- a/libavfilter/af_join.c
+++ b/libavfilter/af_join.c
@@ -485,6 +485,9 @@ static int activate(AVFilterContext *ctx)
                 return 0;
             }
         }
+        if (!s->input_frames[0]) {
+            return 0;
+        }
     }
 
     nb_samples = s->input_frames[0]->nb_samples;