[FFmpeg-devel] [PATCH 6/6] avcodec/wmaprodec: Fix cleanup on error

[Paul B Mahol]

probably ok

On 10/9/19, Michael Niedermayer <michael at niedermayer.cc> wrote:
> Fixes: memleaks
> Fixes:
> 18023/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_XMA2_fuzzer-5642535011090432
>
> Found-by: continuous fuzzing process
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> ---
>  libavcodec/wmaprodec.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c
> index 6ce2dd4adb..5c18479b3b 100644
> --- a/libavcodec/wmaprodec.c
> +++ b/libavcodec/wmaprodec.c
> @@ -1888,12 +1888,14 @@ static av_cold int xma_decode_init(AVCodecContext
> *avctx)
>          s->num_streams = avctx->extradata[1];
>          if (avctx->extradata_size != (32 + ((avctx->extradata[0]==3)?0:8) +
> 4*s->num_streams)) {
>              av_log(avctx, AV_LOG_ERROR, "Incorrect XMA2 extradata size\n");
> +            s->num_streams = 0;
>              return AVERROR(EINVAL);
>          }
>      } else if (avctx->codec_id == AV_CODEC_ID_XMA1 && avctx->extradata_size
>>= 4) { /* XMAWAVEFORMAT */
>          s->num_streams = avctx->extradata[4];
>          if (avctx->extradata_size != (8 + 20*s->num_streams)) {
>              av_log(avctx, AV_LOG_ERROR, "Incorrect XMA1 extradata size\n");
> +            s->num_streams = 0;
>              return AVERROR(EINVAL);
>          }
>      } else {
> @@ -1906,6 +1908,7 @@ static av_cold int xma_decode_init(AVCodecContext
> *avctx)
>          s->num_streams <= 0
>      ) {
>          avpriv_request_sample(avctx, "More than %d channels in %d streams",
> XMA_MAX_CHANNELS, s->num_streams);
> +        s->num_streams = 0;
>          return AVERROR_PATCHWELCOME;
>      }
>
> @@ -1938,6 +1941,7 @@ static av_cold int xma_decode_end(AVCodecContext
> *avctx)
>          decode_end(&s->xma[i]);
>          av_frame_free(&s->frames[i]);
>      }
> +    s->num_streams = 0;
>
>      return 0;
>  }
> @@ -1993,6 +1997,7 @@ AVCodec ff_wmapro_decoder = {
>      .close          = wmapro_decode_end,
>      .decode         = wmapro_decode_packet,
>      .capabilities   = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1,
> +    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
>      .flush          = wmapro_flush,
>      .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
>                                                        AV_SAMPLE_FMT_NONE },
> @@ -2008,6 +2013,7 @@ AVCodec ff_xma1_decoder = {
>      .close          = xma_decode_end,
>      .decode         = xma_decode_packet,
>      .capabilities   = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1 |
> AV_CODEC_CAP_DELAY,
> +    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
>      .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
>                                                        AV_SAMPLE_FMT_NONE },
>  };
> @@ -2023,6 +2029,7 @@ AVCodec ff_xma2_decoder = {
>      .decode         = xma_decode_packet,
>      .flush          = xma_flush,
>      .capabilities   = AV_CODEC_CAP_SUBFRAMES | AV_CODEC_CAP_DR1 |
> AV_CODEC_CAP_DELAY,
> +    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
>      .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP,
>                                                        AV_SAMPLE_FMT_NONE },
>  };
> --
> 2.23.0
>
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