avformat/mov: fix overflow in corrected_dts calculation

Fixes: Integer-overflow Fixes: 400093647/clusterfuzz-testcase-minimized-media_metadata_parser_fuzzer-4794341562187776

James Almer committed 1 year ago

Commit 25c43921 parent 01f63ef1 file · +1 −1Browse files

Unified · Split

libavformat/mov.c+1−1

@@ -3539,7 +3539,7 @@ static int mov_read_stts(MOVContext c, AVIOContext pb, MOVAtom atom) · 3538 unmodified lines
3539	av_log(c->fc, AV_LOG_WARNING, "Too large sample offset %u in stts entry %u with count %u in st:%d. Clipping to 1.\n",	3539	av_log(c->fc, AV_LOG_WARNING, "Too large sample offset %u in stts entry %u with count %u in st:%d. Clipping to 1.\n",
3540	sample_duration, i, sample_count, st->index);	3540	sample_duration, i, sample_count, st->index);
3541	sc->stts_data[i].duration = 1;	3541	sc->stts_data[i].duration = 1;
3542	corrected_dts += (delta_magnitude < 0 ? (int64_t)delta_magnitude : 1) * sample_count;	3542	corrected_dts = av_sat_add64(corrected_dts, (delta_magnitude < 0 ? (int64_t)delta_magnitude : 1) * sample_count);
3543	} else {	3543	} else {
3544	corrected_dts += sample_duration * (uint64_t)sample_count;	3544	corrected_dts += sample_duration * (uint64_t)sample_count;
3545	}	3545	}