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length protection in ReadSegment

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This commit is contained in:
v2ray 2016-06-30 00:12:36 +02:00
parent f050113925
commit 7056b414e2
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GPG Key ID: 7251FFA14BB18169
1 changed files with 21 additions and 4 deletions
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25
transport/internet/kcp/segment.go
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@ -116,7 +116,7 @@ func (this *CmdOnlySegment) Bytes(b []byte) []byte {
func (this *CmdOnlySegment) Release() {}
func ReadSegment(buf []byte) (ISegment, []byte) {
if len(buf) <= 6 {
if len(buf) <= 4 {
return nil, nil
}
@ -132,6 +132,9 @@ func ReadSegment(buf []byte) (ISegment, []byte) {
Conv: conv,
Opt: opt,
}
if len(buf) < 16 {
return nil, nil
}
seg.Timestamp = serial.BytesToUint32(buf)
buf = buf[4:]
@ -141,11 +144,14 @@ func ReadSegment(buf []byte) (ISegment, []byte) {
seg.SendingNext = serial.BytesToUint32(buf)
buf = buf[4:]
len := serial.BytesToUint16(buf)
dataLen := int(serial.BytesToUint16(buf))
buf = buf[2:]
seg.Data = alloc.NewSmallBuffer().Clear().Append(buf[:len])
buf = buf[len:]
if len(buf) < dataLen {
return nil, nil
}
seg.Data = alloc.NewSmallBuffer().Clear().Append(buf[:dataLen])
buf = buf[dataLen:]
return seg, buf
}
@ -155,6 +161,10 @@ func ReadSegment(buf []byte) (ISegment, []byte) {
Conv: conv,
Opt: opt,
}
if len(buf) < 9 {
return nil, nil
}
seg.ReceivingWindow = serial.BytesToUint32(buf)
buf = buf[4:]
@ -167,6 +177,9 @@ func ReadSegment(buf []byte) (ISegment, []byte) {
seg.NumberList = make([]uint32, 0, seg.Count)
seg.TimestampList = make([]uint32, 0, seg.Count)
if len(buf) < int(seg.Count)*8 {
return nil, nil
}
for i := 0; i < int(seg.Count); i++ {
seg.NumberList = append(seg.NumberList, serial.BytesToUint32(buf))
seg.TimestampList = append(seg.TimestampList, serial.BytesToUint32(buf[4:]))
@ -182,6 +195,10 @@ func ReadSegment(buf []byte) (ISegment, []byte) {
Opt: opt,
}
if len(buf) < 8 {
return nil, nil
}
seg.SendingNext = serial.BytesToUint32(buf)
buf = buf[4:]