From fa6c8830740829d38f4ac7bfc8d8131ae44b9ade Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Mon, 30 Mar 2020 10:40:59 +0200
Subject: [PATCH] fix ptr invalidation in Vec::truncate

---
 src/liballoc/vec.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/liballoc/vec.rs b/src/liballoc/vec.rs
index 6f264399fa8..1c8c4428169 100644
--- a/src/liballoc/vec.rs
+++ b/src/liballoc/vec.rs
@@ -739,7 +739,8 @@ impl<T> Vec<T> {
             if len > self.len {
                 return;
             }
-            let s = self.get_unchecked_mut(len..) as *mut _;
+            let remaining_len = self.len - len;
+            let s = slice::from_raw_parts_mut(self.as_mut_ptr().add(len), remaining_len);
             self.len = len;
             ptr::drop_in_place(s);
         }