Fix UB in offset calculation

rust-lang-nursery · Apr 21, 2015 · 12b30f5 · 12b30f5
1 parent 9aa9fb8
commit 12b30f5
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/lib.rs b/src/lib.rs
@@ -28,7 +28,10 @@ extern "C" {
 
 fn sun_path_offset() -> usize {
     unsafe {
-        &(*(0 as *const libc::sockaddr_un)).sun_path as *const _ as usize
+        let addr: libc::sockaddr_un = mem::zeroed();
+        let base = &addr as *const _ as usize;
+        let path = &addr.sun_path as *const _ as usize;
+        path - base
     }
 }