From: Torsten Scheck <torsten.scheck@gmx.de>
Date: Mon, 3 Jul 2017 16:04:37 +0000 (+0200)
Subject: Fix potential invalid memory reference.
X-Git-Url: https://git.ralfj.de/rust-101.git/commitdiff_plain/383f5bdfee5830c66cd273f5b4ee9be47d093b31?ds=sidebyside;hp=--cc

Fix potential invalid memory reference.
---

383f5bdfee5830c66cd273f5b4ee9be47d093b31
diff --git a/solutions/src/list.rs b/solutions/src/list.rs
index 3206982..c7ae6ad 100644
--- a/solutions/src/list.rs
+++ b/solutions/src/list.rs
@@ -53,6 +53,8 @@ impl<T> LinkedList<T> {
             if new_last.is_null() {
                 // The list is now empty.
                 self.first = new_last;
+            } else {
+                unsafe { (*new_last).next = ptr::null_mut() };
             }
             let last = unsafe { raw_into_box(last) } ;
             Some(last.data)
@@ -86,6 +88,8 @@ impl<T> LinkedList<T> {
             if new_first.is_null() {
                 // The list is now empty.
                 self.last = new_first;
+            } else {
+                unsafe { (*new_first).prev = ptr::null_mut() };
             }
             let first = unsafe { raw_into_box(first) } ;
             Some(first.data)