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Fix a potential OOB error in SSZ deserialization

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Zahary Karadjov 2019-09-27 19:48:12 +03:00 committed by zah
parent c39d4f1817
commit a336285922
1 changed files with 2 additions and 1 deletions
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3
beacon_chain/ssz/bytes_reader.nim
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@ -80,7 +80,8 @@ proc readSszValue*(input: openarray[byte], T: type): T =
type ElemType = type result[0] type ElemType = type result[0]
when ElemType is byte|char: when ElemType is byte|char:
result.setLen input.len result.setLen input.len
copyMem(addr result[0], unsafeAddr input[0], input.len) if input.len > 0:
copyMem(addr result[0], unsafeAddr input[0], input.len)
elif isFixedSize(ElemType): elif isFixedSize(ElemType):
const elemSize = fixedPortionSize(ElemType) const elemSize = fixedPortionSize(ElemType)