Use checked_add in VecDeque::append for ZSTs to avoid overflow

cuviper · Feb 25, 2023 · 379b18b · 379b18b
1 parent 26c9868
commit 379b18b
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/library/alloc/src/collections/vec_deque/mod.rs b/library/alloc/src/collections/vec_deque/mod.rs
@@ -1917,7 +1917,7 @@ impl<T, A: Allocator> VecDeque<T, A> {
     #[stable(feature = "append", since = "1.4.0")]
     pub fn append(&mut self, other: &mut Self) {
         if T::IS_ZST {
-            self.len += other.len;
+            self.len = self.len.checked_add(other.len).expect("capacity overflow");
             other.len = 0;
             other.head = 0;
             return;