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avformat/asfdec: Fix DoS in asf_build_simple_index()

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Fixes: Missing EOF check in loop
No testcase

Found-by: Xiaohei and Wangchu from Alibaba Security Team
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-09-05 00:16:29 +02:00
parent 9cb4eb7728
commit afc9c683ed
1 changed files with 5 additions and 0 deletions
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5
libavformat/asfdec_f.c
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@ -1610,6 +1610,11 @@ static int asf_build_simple_index(AVFormatContext *s, int stream_index)
int64_t pos = s->internal->data_offset + s->packet_size * (int64_t)pktnum;
int64_t index_pts = FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
if (avio_feof(s->pb)) {
ret = AVERROR_INVALIDDATA;
goto end;
}
if (pos != last_pos) {
av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d pts: %"PRId64"\n",
pktnum, pktct, index_pts);