Am Mo., 30. März 2020 um 09:30 Uhr schrieb Andreas Rheinhardt
<andreas.rheinha...@gmail.com>:
>
> The WebM DASH Manifest muxer only supports VP8, VP9, Vorbis and Opus,
> but there was no check for this. The codec type is used to get a pointer
> to a string containing the codec name or NULL if it is not one of those
> four codecs. Said pointer has then been used without further checks as
> string for the %s conversion specifier in an avio_printf()) call which
> is undefined behaviour.
>
> This commit adds a check for the supported codec types.
>
> Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@gmail.com>
> ---
> libavformat/webmdashenc.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/libavformat/webmdashenc.c b/libavformat/webmdashenc.c
> index d05b265330..182a361eae 100644
> --- a/libavformat/webmdashenc.c
> +++ b/libavformat/webmdashenc.c
> @@ -516,6 +516,14 @@ static int
> webm_dash_manifest_write_header(AVFormatContext *s)
> double start = 0.0;
> int ret;
> WebMDashMuxContext *w = s->priv_data;
> +
> + for (unsigned i = 0; i < s->nb_streams; i++) {
> + enum AVCodecID codec_id = s->streams[i]->codecpar->codec_id;
> + if ((codec_id != AV_CODEC_ID_VP8) && (codec_id != AV_CODEC_ID_VP9) &&
> + (codec_id != AV_CODEC_ID_VORBIS) && (codec_id !=
> AV_CODEC_ID_OPUS))
> + return AVERROR(EINVAL);
Too man parenthesis imo...
Carl Eugen
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