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| author | Chris Evans <cevans@chromium.org> | 2011-06-29 15:44:40 -0700 |
|---|---|---|
| committer | Ronald S. Bultje <rsbultje@gmail.com> | 2011-07-11 16:37:11 -0700 |
| commit | 4cc3467e7abfea7e8d03b6af511f7719038a5a98 (patch) | |
| tree | be47610fc6a7dab1a33f01257eac9cfb65405ada /libavformat/oggdec.c | |
| parent | b047941d7da470ba0dcedb1fd0aa828075265ffc (diff) | |
| download | ffmpeg-4cc3467e7abfea7e8d03b6af511f7719038a5a98.tar.gz | |
oggdec: prevent heap corruption.
Specifically crafted samples can reinit ogg->streams[] while
reading samples, and thus we should not cache old pointers since
these may no longer be valid.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
Diffstat (limited to 'libavformat/oggdec.c')
| -rw-r--r-- | libavformat/oggdec.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/libavformat/oggdec.c b/libavformat/oggdec.c index e33de7d978..3d03a5f974 100644 --- a/libavformat/oggdec.c +++ b/libavformat/oggdec.c @@ -592,15 +592,15 @@ static int64_t ogg_read_timestamp(AVFormatContext *s, int stream_index, int64_t *pos_arg, int64_t pos_limit) { struct ogg *ogg = s->priv_data; - struct ogg_stream *os = ogg->streams + stream_index; AVIOContext *bc = s->pb; int64_t pts = AV_NOPTS_VALUE; - int i; + int i = -1; avio_seek(bc, *pos_arg, SEEK_SET); ogg_reset(ogg); while (avio_tell(bc) < pos_limit && !ogg_packet(s, &i, NULL, NULL, pos_arg)) { if (i == stream_index) { + struct ogg_stream *os = ogg->streams + stream_index; pts = ogg_calc_pts(s, i, NULL); if (os->keyframe_seek && !(os->pflags & AV_PKT_FLAG_KEY)) pts = AV_NOPTS_VALUE; @@ -626,6 +626,7 @@ static int ogg_read_seek(AVFormatContext *s, int stream_index, os->keyframe_seek = 1; ret = av_seek_frame_binary(s, stream_index, timestamp, flags); + os = ogg->streams + stream_index; if (ret < 0) os->keyframe_seek = 0; return ret; |