From 7e35e0224cb1e82bfefdedeff9db946a05363c83 Mon Sep 17 00:00:00 2001
From: Lynne <dev@lynne.ee>
Date: Sat, 29 Jan 2022 01:02:37 +0100
Subject: [PATCH] lavu/tx: do not unconditionally free subcontexts if
 initialization fails

If a codelet initializes 2 subtransforms, and the second one fails,
the failure would free all subcontexts.
Instead, if there are subcontexts still left, don't free the array.
If all initializations fail, the init() function will return,
and reset_ctx() from the previous step will clean up all contained
subtransforms.
---
 libavutil/tx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavutil/tx.c b/libavutil/tx.c
index a90ccffcc4..573f4863d1 100644
--- a/libavutil/tx.c
+++ b/libavutil/tx.c
@@ -606,7 +606,8 @@ av_cold int ff_tx_init_subtx(AVTXContext *s, enum AVTXType type,
             break;
     }
 
-    av_freep(&s->sub);
+    if (!s->nb_sub)
+        av_freep(&s->sub);
 
 end:
     av_free(cd_matches);