From e40107c1ad12a53bb7d81538f35b85ed3d11c4b0 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Sun, 15 Jan 2017 14:52:04 +0100
Subject: [PATCH] pthread_frame: do not share priv_data between multiple codec
 contexts

Specifically, between the user-facing one and the first frame thread
one.

This is fragile and dangerous, allocate separate private data for each
per-thread context.
---
 libavcodec/pthread_frame.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/libavcodec/pthread_frame.c b/libavcodec/pthread_frame.c
index 69671c90fb..1ad43d438a 100644
--- a/libavcodec/pthread_frame.c
+++ b/libavcodec/pthread_frame.c
@@ -702,7 +702,7 @@ void ff_frame_thread_free(AVCodecContext *avctx, int thread_count)
         av_packet_unref(&p->avpkt);
         av_freep(&p->released_buffers);
 
-        if (i && p->avctx) {
+        if (p->avctx) {
             if (codec->priv_class)
                 av_opt_free(p->avctx->priv_data);
             av_freep(&p->avctx->priv_data);
@@ -812,7 +812,7 @@ int ff_frame_thread_init(AVCodecContext *avctx)
         copy->internal->thread_ctx = p;
         copy->internal->last_pkt_props = &p->avpkt;
 
-        if (i) {
+        if (codec->priv_data_size) {
             copy->priv_data = av_mallocz(codec->priv_data_size);
             if (!copy->priv_data) {
                 err = AVERROR(ENOMEM);
@@ -825,9 +825,11 @@ int ff_frame_thread_init(AVCodecContext *avctx)
                 if (err < 0)
                     goto error;
             }
-            copy->internal->is_copy = 1;
         }
 
+        if (i)
+            copy->internal->is_copy = 1;
+
         if (codec->init)
             err = codec->init(copy);