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reflect: use Value.Len instead of conversion to slice header #48346

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reflect: use Value.Len instead of conversion to slice header #48346

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9 changes: 4 additions & 5 deletions src/reflect/value.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2940,8 +2940,7 @@ func (v Value) CanConvert(t Type) bool {
// from slice to pointer-to-array.
if vt.Kind() == Slice && t.Kind() == Ptr && t.Elem().Kind() == Array {
n := t.Elem().Len()
h := (*unsafeheader.Slice)(v.ptr)
if n > h.Len {
if n > v.Len() {
return false
}
}
Expand Down Expand Up @@ -3208,10 +3207,10 @@ func cvtStringRunes(v Value, t Type) Value {
// convertOp: []T -> *[N]T
func cvtSliceArrayPtr(v Value, t Type) Value {
n := t.Elem().Len()
h := (*unsafeheader.Slice)(v.ptr)
if n > h.Len {
panic("reflect: cannot convert slice with length " + itoa.Itoa(h.Len) + " to pointer to array with length " + itoa.Itoa(n))
if n > v.Len() {
panic("reflect: cannot convert slice with length " + itoa.Itoa(v.Len()) + " to pointer to array with length " + itoa.Itoa(n))
}
h := (*unsafeheader.Slice)(v.ptr)
return Value{t.common(), h.Data, v.flag&^(flagIndir|flagAddr|flagKindMask) | flag(Ptr)}
}

Expand Down