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Fix a potential make len<0

This commit is contained in:
Qian Wang 2019-08-07 17:22:40 +01:00
parent b7549c0664
commit e3de2b9852
1 changed files with 5 additions and 1 deletions
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6
internal/multiplex/obfs.go
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@ -89,7 +89,11 @@ func MakeDeobfs(salsaKey [32]byte, payloadCipher cipher.AEAD) Deobfser {
closing := header[8]
extraLen := header[9]
outputPayload := make([]byte, len(payload)-int(extraLen))
outputLen := len(payload) - int(extraLen)
if outputLen < 0 {
return nil, errors.New("extra length is greater than total payload length")
}
outputPayload := make([]byte, outputLen)
if payloadCipher == nil {
copy(outputPayload, payload)