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fix str mutating through a ptr derived from &self #58200

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merged 4 commits into from
Feb 13, 2019
Merged

fix str mutating through a ptr derived from &self #58200

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346dc37
fix str mutating through a ptr derived from &self
RalfJung Feb 5, 2019
13bbba2
remove now-unneeded raw ptr casts
RalfJung Feb 6, 2019
a996f2c
add tracking issue
RalfJung Feb 6, 2019
66c894e
also fix bad use of shared ref in split_at_mut
RalfJung Feb 7, 2019
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remove now-unneeded raw ptr casts
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@RalfJung
RalfJung committed Feb 6, 2019
commit 13bbba273c2a3d6a83c081ba3c2129f8d572c1b7
6 changes: 3 additions & 3 deletions src/libcore/str/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1759,7 +1759,7 @@ mod traits {
unsafe fn get_unchecked_mut(self, slice: &mut str) -> &mut Self::Output {
let ptr = slice.as_mut_ptr().add(self.start);
let len = self.end - self.start;
super::from_utf8_unchecked_mut(slice::from_raw_parts_mut(ptr as *mut u8, len))
super::from_utf8_unchecked_mut(slice::from_raw_parts_mut(ptr, len))
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Notice that this raw ptr cast here is the "canary" that gave away that the old code was wrong -- it was actually casting *const u8 to *mut u8, which should not have been necessary.

}
#[inline]
fn index(self, slice: &str) -> &Self::Output {
Expand Down Expand Up @@ -1822,7 +1822,7 @@ mod traits {
#[inline]
unsafe fn get_unchecked_mut(self, slice: &mut str) -> &mut Self::Output {
let ptr = slice.as_mut_ptr();
super::from_utf8_unchecked_mut(slice::from_raw_parts_mut(ptr as *mut u8, self.end))
super::from_utf8_unchecked_mut(slice::from_raw_parts_mut(ptr, self.end))
}
#[inline]
fn index(self, slice: &str) -> &Self::Output {
Expand Down Expand Up @@ -1885,7 +1885,7 @@ mod traits {
unsafe fn get_unchecked_mut(self, slice: &mut str) -> &mut Self::Output {
let ptr = slice.as_mut_ptr().add(self.start);
let len = slice.len() - self.start;
super::from_utf8_unchecked_mut(slice::from_raw_parts_mut(ptr as *mut u8, len))
super::from_utf8_unchecked_mut(slice::from_raw_parts_mut(ptr, len))
}
#[inline]
fn index(self, slice: &str) -> &Self::Output {
Expand Down