avformat/matroskadec: Use rounded down duration in get_cue_desc() check
Floating point is evil, it would be better if duration was not a double
Fixes: Infinite loop
Fixes: 45123/clusterfuzz-testcase-minimized-ffmpeg_dem_WEBM_DASH_MANIFEST_fuzzer-6725052291219456
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <[email protected]>
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 1a6606a..c6709a2 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -4013,7 +4013,8 @@
CueDesc cue_desc;
int i;
- if (ts >= matroska->duration * matroska->time_scale) return (CueDesc) {-1, -1, -1, -1};
+ if (ts >= (int64_t)(matroska->duration * matroska->time_scale))
+ return (CueDesc) {-1, -1, -1, -1};
for (i = 1; i < nb_index_entries; i++) {
if (index_entries[i - 1].timestamp * matroska->time_scale <= ts &&
index_entries[i].timestamp * matroska->time_scale > ts) {
