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mpeg_spu: Fatal error on infinite loop

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This commit is contained in:
Mattias Wadman 2022-01-24 16:53:55 +01:00
parent 6fcfa77300
commit febce5a5a4
1 changed files with 8 additions and 0 deletions
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8
format/mpeg/mpeg_spu.go
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@ -103,6 +103,9 @@ func spuDecode(d *decode.D, in interface{}) interface{} {
d.FieldU16("size")
dcsqtOffset := d.FieldU16("dcsqt_offset")
// to catch infinite loops
offsetSeen := map[uint64]struct{}{}
d.SeekAbs(int64(dcsqtOffset) * 8)
d.FieldArray("dcsqt", func(d *decode.D) {
lastDCSQ := false
@ -117,6 +120,11 @@ func spuDecode(d *decode.D, in interface{}) interface{} {
return
}
if _, ok := offsetSeen[offset]; ok {
d.Fatalf("dcsqt loop detected for %d", offset)
}
offsetSeen[offset] = struct{}{}
var pxdTFOffset int64
var pxdBFOffset int64
var width uint64