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lavf: do basic sanity checking on muxed packets

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Reject packets for non-existing or attachment streams.
This commit is contained in:
Anton Khirnov 2014-01-20 14:10:01 +01:00
parent 5de64bb34d
commit 7b03b65bf0
1 changed files with 27 additions and 0 deletions
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27
libavformat/mux.c
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@ -429,10 +429,33 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt)
return ret;
}
static int check_packet(AVFormatContext *s, AVPacket *pkt)
{
if (!pkt)
return 0;
if (pkt->stream_index < 0 || pkt->stream_index >= s->nb_streams) {
av_log(s, AV_LOG_ERROR, "Invalid packet stream index: %d\n",
pkt->stream_index);
return AVERROR(EINVAL);
}
if (s->streams[pkt->stream_index]->codec->codec_type == AVMEDIA_TYPE_ATTACHMENT) {
av_log(s, AV_LOG_ERROR, "Received a packet for an attachment stream.\n");
return AVERROR(EINVAL);
}
return 0;
}
int av_write_frame(AVFormatContext *s, AVPacket *pkt)
{
int ret;
ret = check_packet(s, pkt);
if (ret < 0)
return ret;
if (!pkt) {
if (s->oformat->flags & AVFMT_ALLOW_FLUSH)
return s->oformat->write_packet(s, pkt);
@ -560,6 +583,10 @@ int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt)
{
int ret, flush = 0;
ret = check_packet(s, pkt);
if (ret < 0)
return ret;
if (pkt) {
AVStream *st = s->streams[pkt->stream_index];