From 6559858de9a3c18bd5cf4892cb7b5b90180e7d97 Mon Sep 17 00:00:00 2001
From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Date: Wed, 23 Feb 2022 20:11:51 +0100
Subject: [PATCH] fftools/ffmpeg: Don't presume frame_queue to have been
 allocated

Fixes segfaults upon allocation failure.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 fftools/ffmpeg.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/fftools/ffmpeg.c b/fftools/ffmpeg.c
index d5cd010a9c..9a3fdc636d 100644
--- a/fftools/ffmpeg.c
+++ b/fftools/ffmpeg.c
@@ -527,11 +527,13 @@ static void ffmpeg_cleanup(int ret)
         for (j = 0; j < fg->nb_inputs; j++) {
             InputFilter *ifilter = fg->inputs[j];
             struct InputStream *ist = ifilter->ist;
-            AVFrame *frame;
 
-            while (av_fifo_read(ifilter->frame_queue, &frame, 1) >= 0)
-                av_frame_free(&frame);
-            av_fifo_freep2(&ifilter->frame_queue);
+            if (ifilter->frame_queue) {
+                AVFrame *frame;
+                while (av_fifo_read(ifilter->frame_queue, &frame, 1) >= 0)
+                    av_frame_free(&frame);
+                av_fifo_freep2(&ifilter->frame_queue);
+            }
             av_freep(&ifilter->displaymatrix);
             if (ist->sub2video.sub_queue) {
                 AVSubtitle sub;