string to int signedness cast "uint64(num)", might result in lost or misinterpreted data
75 if err != nil {
76 return results, err
77 }
78 results = append(results, uint64(num)) 79 }
80 return results, nil
81 } else {string to int signedness cast "uint32(val)", might result in lost or misinterpreted data
52
53func init() {
54 if val, err := strconv.Atoi(os.Getenv("GOGC")); err == nil {
55 defaultGCPercent = uint32(val) 56 }
57 SetMinGCPercent(defaultMinGCPercent)
58 SetMaxGCPercent(defaultMaxGCPercent)
Description
It is possible for integer casting, if not appropriately done to lose the signedness of the integer and might cause overflow as well.
For example:
- int64 must not be casted to: "uint8", "uint16", "uint32", "uint64", "int8", "int16", "int32"
int64 can lose signedness if converted to unsigned integer and if converted to
a signed integer but a type other than int64, then overflow might occur.
uint64must not be casted to: "uint8", "uint16", "uint32", "int8", "int16", "int32", "int64"uint64would lose signedness if converted to a signed integer and might overflow. If converted to an unsigned integer, i.e., a type other thanuint64, overflow might occur.
Bad practice
n, err := strconv.Atoi("42")
if err != nil {
panic(err)
}
// `n` is of type `int`, so it is either `int64` or `int32` depending on the platform.
// Casting it to `uint8` might result in loss of signedness of the integer and might
// not give expected results.
_ = uint8(n)