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fix OOB pointer formed in Vec::index

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Move the length check to before using `index` with `ptr::add` to prevent
an out of bounds pointer from being formed.

Fixes #122760
This commit is contained in:
Joshua Wong 2024-03-19 22:47:35 -05:00
parent a77c20c4b9
commit 37718f949f
1 changed files with 3 additions and 4 deletions
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7
library/alloc/src/vec/mod.rs
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@ -1541,6 +1541,9 @@ impl<T, A: Allocator> Vec<T, A> {
}
let len = self.len();
if index > len {
assert_failed(index, len);
}
// space for the new element
if len == self.buf.capacity() {
@ -1556,10 +1559,6 @@ impl<T, A: Allocator> Vec<T, A> {
// Shift everything over to make space. (Duplicating the
// `index`th element into two consecutive places.)
ptr::copy(p, p.add(1), len - index);
} else if index == len {
// No elements need shifting.
} else {
assert_failed(index, len);
}
// Write it in, overwriting the first copy of the `index`th
// element.