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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-06-23 01:43:14 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-07-02 10:20:36 +0200 |
| commit | 3ce81bf96047717dec9974c3aab7c0bb08b4e72d (patch) | |
| tree | 7707f7313dc3f79aecf5323bee55dec5b7d2abad | |
| parent | dd273d359e45ab69398ac0dc41206d5f1a9371bf (diff) | |
| download | ffmpeg-3ce81bf96047717dec9974c3aab7c0bb08b4e72d.tar.gz | |
avformat/microdvddec: skip malformed lines without frame number.
Fixes: signed integer overflow: 1 - -9223372036854775808 cannot be represented in type 'long'
Fixes: 23490/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5133490093031424
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit a8fb7612a97530bdd0b2549dacf91dcf71a3187a)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
| -rw-r--r-- | libavformat/microdvddec.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/libavformat/microdvddec.c b/libavformat/microdvddec.c index 8759200f88..1f871b2518 100644 --- a/libavformat/microdvddec.c +++ b/libavformat/microdvddec.c @@ -94,6 +94,7 @@ static int microdvd_read_header(AVFormatContext *s) int64_t pos = avio_tell(s->pb); int len = ff_get_line(s->pb, line_buf, sizeof(line_buf)); char *line = line_buf; + int64_t pts; if (!strncmp(line, bom, 3)) line += 3; @@ -137,13 +138,16 @@ static int microdvd_read_header(AVFormatContext *s) SKIP_FRAME_ID; if (!*p) continue; + pts = get_pts(line); + if (pts == AV_NOPTS_VALUE) + continue; sub = ff_subtitles_queue_insert(µdvd->q, p, strlen(p), 0); if (!sub) { ret = AVERROR(ENOMEM); goto fail; } sub->pos = pos; - sub->pts = get_pts(line); + sub->pts = pts; sub->duration = get_duration(line); } ff_subtitles_queue_finalize(s, µdvd->q); |