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Remove checked_add in Layout::repeat #67174

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Dec 11, 2019
Merged

Remove checked_add in Layout::repeat #67174

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7 changes: 5 additions & 2 deletions src/libcore/alloc.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -239,8 +239,11 @@ impl Layout {
#[unstable(feature = "alloc_layout_extra", issue = "55724")]
#[inline]
pub fn repeat(&self, n: usize) -> Result<(Self, usize), LayoutErr> {
let padded_size = self.size().checked_add(self.padding_needed_for(self.align()))
.ok_or(LayoutErr { private: () })?;
// This cannot overflow. Quoting from the invariant of Layout:
// > `size`, when rounded up to the nearest multiple of `align`,
// > must not overflow (i.e., the rounded value must be less than
// > `usize::MAX`)
let padded_size = self.size() + self.padding_needed_for(self.align());
let alloc_size = padded_size.checked_mul(n)
.ok_or(LayoutErr { private: () })?;

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