[FFmpeg-devel] [PATCH] Fix crash in join filter

[Paul B Mahol]

On 2/3/18, Nikolas Bowe <nbowe-at-google.com at ffmpeg.org> wrote:
> Previously if ff_outlink_frame_wanted() returned 0 it could dereference a
> null pointer when trying to read nb_samples.
> ---
>  libavfilter/af_join.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/libavfilter/af_join.c b/libavfilter/af_join.c
> index cf5131e8dc..4f86e13558 100644
> --- a/libavfilter/af_join.c
> +++ b/libavfilter/af_join.c
> @@ -485,6 +485,9 @@ static int activate(AVFilterContext *ctx)
>                  return 0;
>              }
>          }
> +        if (!s->input_frames[0]) {
> +            return 0;
> +        }
>      }
>
>      nb_samples = s->input_frames[0]->nb_samples;
> --
> 2.16.0.rc1.238.g530d649a79-goog
>
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>

lgtm