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fix(lib): prevent integer overflow in AddToPort #595

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fix(lib): prevent integer overflow in AddToPort #595

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4 changes: 4 additions & 0 deletions lib/util.go
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Original file line number Diff line number Diff line change
Expand Up @@ -752,6 +752,10 @@ func AddToPort(portStr string, add uint64) (string, ErrorI) {
if port < MinAllowedPort {
return "", ErrBadPortLowLimit()
}
// check if add would cause overflow when converting to int
if add > math.MaxInt64 {
return "", ErrMaxPort()
}
// add the given number to the port
newPort := port + int(add)
// ensure the new port doesn't exceed the max port number (65535)
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