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avformat/oggdec: Initialize return value from ogg_read_page() and check it everywhere

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Fixes regression since 9ad47762c1
Fixes: out of array access
Fixes: 22172/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5658535590625280

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Lynne <dev@lynne.ee>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-06-06 19:14:04 +02:00
parent 7826fbfeaa
commit 108ee4b4a5
1 changed files with 3 additions and 1 deletions
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4
libavformat/oggdec.c
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@ -412,6 +412,7 @@ static int ogg_read_page(AVFormatContext *s, int *sid, int probing)
if (idx < 0)
av_free(readout_buf);
avio_seek(bc, start_pos, SEEK_SET);
*sid = -1;
return 0;
}
@ -422,6 +423,7 @@ static int ogg_read_page(AVFormatContext *s, int *sid, int probing)
if (idx < 0)
av_free(readout_buf);
avio_seek(bc, start_pos, SEEK_SET);
*sid = -1;
return 0;
}
@ -661,7 +663,7 @@ static int ogg_get_length(AVFormatContext *s)
ogg->page_pos = -1;
while (!ogg_read_page(s, &i, 1)) {
if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
if (i >= 0 && ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0 &&
ogg->streams[i].codec) {
s->streams[i]->duration =
ogg_gptopts(s, i, ogg->streams[i].granule, NULL);