[FFmpeg-devel] [PATCH 2/2] avformat/nsvdec: Fix memleaks on errors while reading the header

[Paul B Mahol]

lgtm

On 3/18/20, Michael Niedermayer <michael at niedermayer.cc> wrote:
> Fixes: memleaks
> Fixes:
> 21084/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5655975492321280
>
> Found-by: continuous fuzzing process
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> ---
>  libavformat/nsvdec.c | 20 ++++++++++++++------
>  1 file changed, 14 insertions(+), 6 deletions(-)
>
> diff --git a/libavformat/nsvdec.c b/libavformat/nsvdec.c
> index 7aa1b605b0..b5d9313778 100644
> --- a/libavformat/nsvdec.c
> +++ b/libavformat/nsvdec.c
> @@ -211,6 +211,7 @@ static const AVCodecTag nsv_codec_audio_tags[] = {
>
>  //static int nsv_load_index(AVFormatContext *s);
>  static int nsv_read_chunk(AVFormatContext *s, int fill_header);
> +static int nsv_read_close(AVFormatContext *s);
>
>  /* try to find something we recognize, and set the state accordingly */
>  static int nsv_resync(AVFormatContext *s)
> @@ -492,25 +493,32 @@ static int nsv_read_header(AVFormatContext *s)
>      nsv->ahead[0].data = nsv->ahead[1].data = NULL;
>
>      for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
> -        if (nsv_resync(s) < 0)
> -            return -1;
> +        err = nsv_resync(s);
> +        if (err < 0)
> +            goto fail;
>          if (nsv->state == NSV_FOUND_NSVF) {
>              err = nsv_parse_NSVf_header(s);
>              if (err < 0)
> -                return err;
> +                goto fail;
>          }
>              /* we need the first NSVs also... */
>          if (nsv->state == NSV_FOUND_NSVS) {
>              err = nsv_parse_NSVs_header(s);
>              if (err < 0)
> -                return err;
> +                goto fail;
>              break; /* we just want the first one */
>          }
>      }
> -    if (s->nb_streams < 1) /* no luck so far */
> -        return -1;
> +    if (s->nb_streams < 1) { /* no luck so far */
> +        err = AVERROR_INVALIDDATA;
> +        goto fail;
> +    }
> +
>      /* now read the first chunk, so we can attempt to decode more info */
>      err = nsv_read_chunk(s, 1);
> +fail:
> +    if (err < 0)
> +        nsv_read_close(s);
>
>      av_log(s, AV_LOG_TRACE, "parsed header\n");
>      return err;
> --
> 2.17.1
>
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