Re: [FFmpeg-devel] [PATCH] avcodec/pngdec: Cleanup generically on init failure

[Andreas Rheinhardt <andreas.rheinhardt@outlook.com>]

Andreas Rheinhardt:
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
> I did not add these codecs the last time I searched for codecs
> to add the FF_CODEC_CAP_INIT_CLEANUP because I was unsure whether
> calling ff_thread_release_buffer() on a NULL frame was safe
> (it is).
> 
>  libavcodec/pngdec.c | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/libavcodec/pngdec.c b/libavcodec/pngdec.c
> index 3c00007907..6a22f8d9d8 100644
> --- a/libavcodec/pngdec.c
> +++ b/libavcodec/pngdec.c
> @@ -1696,11 +1696,8 @@ static av_cold int png_dec_init(AVCodecContext *avctx)
>      s->avctx = avctx;
>      s->last_picture.f = av_frame_alloc();
>      s->picture.f = av_frame_alloc();
> -    if (!s->last_picture.f || !s->picture.f) {
> -        av_frame_free(&s->last_picture.f);
> -        av_frame_free(&s->picture.f);
> +    if (!s->last_picture.f || !s->picture.f)
>          return AVERROR(ENOMEM);
> -    }
>  
>      ff_pngdsp_init(&s->dsp);
>  
> @@ -1741,7 +1738,7 @@ const AVCodec ff_apng_decoder = {
>      .decode         = decode_frame_apng,
>      .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
>      .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
> -    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
> +    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP |
>                        FF_CODEC_CAP_ALLOCATE_PROGRESS,
>  };
>  #endif
> @@ -1759,6 +1756,6 @@ const AVCodec ff_png_decoder = {
>      .update_thread_context = ONLY_IF_THREADS_ENABLED(update_thread_context),
>      .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/,
>      .caps_internal  = FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM | FF_CODEC_CAP_INIT_THREADSAFE |
> -                      FF_CODEC_CAP_ALLOCATE_PROGRESS,
> +                      FF_CODEC_CAP_ALLOCATE_PROGRESS | FF_CODEC_CAP_INIT_CLEANUP,
>  };
>  #endif

Will apply this later today unless there are objections.

- Andreas
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