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swarm/storage: Catch c<0 for varint read overflows

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lash 2018-01-26 02:53:31 +01:00
parent 08fc950a2e
commit d10516b47e
1 changed files with 2 additions and 2 deletions
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4
swarm/storage/resource.go
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@ -861,14 +861,14 @@ func isMultihash(data []byte) int {
cursor := 0 cursor := 0
hashtype, c := binary.Uvarint(data) hashtype, c := binary.Uvarint(data)
log.Trace("ismultihash", "hashtype", hashtype, "c", c) log.Trace("ismultihash", "hashtype", hashtype, "c", c)
if c == 0 { if c <= 0 {
log.Debug("Corrupt multihash data, hashtype is unreadable") log.Debug("Corrupt multihash data, hashtype is unreadable")
return 0 return 0
} }
cursor += c cursor += c
hashlength, c := binary.Uvarint(data[cursor:]) hashlength, c := binary.Uvarint(data[cursor:])
log.Trace("ismultihash", "hashlength", hashlength, "c", c) log.Trace("ismultihash", "hashlength", hashlength, "c", c)
if c == 0 { if c <= 0 {
log.Debug("Corrupt multihash data, hashlength is unreadable") log.Debug("Corrupt multihash data, hashlength is unreadable")
return 0 return 0
} }