[FFmpeg-devel] [PATCH 3/6] avcodec/utils: Sanitize options before using them

[Andreas Rheinhardt]

This is how it is supposed to happen, yet when using frame threading,
the codec's init function has been called before preinit. This can lead
to crashes when e.g. using unsupported lowres values for decoders
together with frame threading.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>
---
 libavcodec/utils.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index 3629813387..7d4ad113df 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -716,6 +716,13 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *code
         avctx->time_base.den = avctx->sample_rate;
     }
 
+    if (av_codec_is_encoder(avctx->codec))
+        ret = ff_encode_preinit(avctx);
+    else
+        ret = ff_decode_preinit(avctx);
+    if (ret < 0)
+        goto free_and_end;
+
     if (!HAVE_THREADS)
         av_log(avctx, AV_LOG_WARNING, "Warning: not compiled with thread support, using thread emulation\n");
 
@@ -737,13 +744,6 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *code
     if (!HAVE_THREADS && !(codec->caps_internal & FF_CODEC_CAP_AUTO_THREADS))
         avctx->thread_count = 1;
 
-    if (av_codec_is_encoder(avctx->codec))
-        ret = ff_encode_preinit(avctx);
-    else
-        ret = ff_decode_preinit(avctx);
-    if (ret < 0)
-        goto free_and_end;
-
     if (   avctx->codec->init && (!(avctx->active_thread_type&FF_THREAD_FRAME)
         || avci->frame_thread_encoder)) {
         ret = avctx->codec->init(avctx);
-- 
2.27.0