#[unstable(feature = "alloc_layout_extra", issue = "55724")]
#[inline]
pub fn repeat(&self, n: usize) -> Result<(Self, usize), LayoutErr> {
- // 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());
+ // Warning, removing the checked_add here led to segfaults in #67174. Further
+ // analysis in #69225 seems to indicate that this is an LTO-related
+ // miscompilation, so #67174 might be able to be reapplied in the future.
+ let padded_size = self
+ .size()
+ .checked_add(self.padding_needed_for(self.align()))
+ .ok_or(LayoutErr { private: () })?;
let alloc_size = padded_size.checked_mul(n).ok_or(LayoutErr { private: () })?;
unsafe {