Re: [FFmpeg-devel] [PATCH 1/4] avcodec/vp3: Fix memleak upon init failure

[Peter Ross]

On Tue, Oct 20, 2020 at 09:53:52AM +0200, Andreas Rheinhardt wrote:
> Up until now, there was no cleanup in case initializing the Theora VLC
> tables failed, leading to memleaks. This commit gets rid of them by
> setting the FF_CODEC_CAP_INIT_CLEANUP flag for all decoders in vp3.c;
> this also allows to remove some (now redundant) cleanup code.
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@gmail.com>
> ---
>  libavcodec/vp3.c | 14 +++++---------
>  1 file changed, 5 insertions(+), 9 deletions(-)
> 
> diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
> index 6fe1ca46a3..0d8d1ff80f 100644
> --- a/libavcodec/vp3.c
> +++ b/libavcodec/vp3.c
> @@ -2287,7 +2287,6 @@ static av_cold int allocate_tables(AVCodecContext 
> *avctx)
>          !s->superblock_fragments || !s->macroblock_coding      ||
>          !s->dc_pred_row ||
>          !s->motion_val[0]        || !s->motion_val[1]) {
> -        vp3_decode_end(avctx);
>          return -1;
>      }
>  
> @@ -2302,12 +2301,8 @@ static av_cold int init_frames(Vp3DecodeContext *s)
>      s->last_frame.f    = av_frame_alloc();
>      s->golden_frame.f  = av_frame_alloc();
>  
> -    if (!s->current_frame.f || !s->last_frame.f || !s->golden_frame.f) {
> -        av_frame_free(&s->current_frame.f);
> -        av_frame_free(&s->last_frame.f);
> -        av_frame_free(&s->golden_frame.f);
> +    if (!s->current_frame.f || !s->last_frame.f || !s->golden_frame.f)
>          return AVERROR(ENOMEM);
> -    }
>  
>      return 0;
>  }
> @@ -3221,7 +3216,8 @@ AVCodec ff_theora_decoder = {
>                               AV_CODEC_CAP_FRAME_THREADS,
>      .flush                 = vp3_decode_flush,
>      .update_thread_context = 
> ONLY_IF_THREADS_ENABLED(vp3_update_thread_context),
> -    .caps_internal         = FF_CODEC_CAP_EXPORTS_CROPPING | 
> FF_CODEC_CAP_ALLOCATE_PROGRESS,
> +    .caps_internal         = FF_CODEC_CAP_EXPORTS_CROPPING | 
> FF_CODEC_CAP_ALLOCATE_PROGRESS |
> +                             FF_CODEC_CAP_INIT_CLEANUP,
>  };
>  #endif
>  
> @@ -3238,7 +3234,7 @@ AVCodec ff_vp3_decoder = {
>                               AV_CODEC_CAP_FRAME_THREADS,
>      .flush                 = vp3_decode_flush,
>      .update_thread_context = 
> ONLY_IF_THREADS_ENABLED(vp3_update_thread_context),
> -    .caps_internal         = FF_CODEC_CAP_ALLOCATE_PROGRESS,
> +    .caps_internal         = FF_CODEC_CAP_ALLOCATE_PROGRESS | 
> FF_CODEC_CAP_INIT_CLEANUP,
>  };
>  
>  #if CONFIG_VP4_DECODER
> @@ -3255,6 +3251,6 @@ AVCodec ff_vp4_decoder = {
>                               AV_CODEC_CAP_FRAME_THREADS,
>      .flush                 = vp3_decode_flush,
>      .update_thread_context = 
> ONLY_IF_THREADS_ENABLED(vp3_update_thread_context),
> -    .caps_internal         = FF_CODEC_CAP_ALLOCATE_PROGRESS,
> +    .caps_internal         = FF_CODEC_CAP_ALLOCATE_PROGRESS | 
> FF_CODEC_CAP_INIT_CLEANUP,
>  };
>  #endif
> -- 
> 2.25.1

looks good

-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)

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