1 files changed, 21 insertions, 0 deletions
diff --git a/tokio/tests/io_read.rs b/tokio/tests/io_read.rs
index 29d7d6d7..cb1aa705 100644
--- a/tokio/tests/io_read.rs
+++ b/tokio/tests/io_read.rs
@@ -36,3 +36,24 @@ async fn read() {
     assert_eq!(n, 11);
     assert_eq!(buf[..], b"hello world"[..]);
 }
+
+struct BadAsyncRead;
+
+impl AsyncRead for BadAsyncRead {
+    fn poll_read(
+        self: Pin<&mut Self>,
+        _cx: &mut Context<'_>,
+        buf: &mut ReadBuf<'_>,
+    ) -> Poll<io::Result<()>> {
+        *buf = ReadBuf::new(Box::leak(vec![0; buf.capacity()].into_boxed_slice()));
+        buf.advance(buf.capacity());
+        Poll::Ready(Ok(()))
+    }
+}
+
+#[tokio::test]
+#[should_panic]
+async fn read_buf_bad_async_read() {
+    let mut buf = Vec::with_capacity(10);
+    BadAsyncRead.read_buf(&mut buf).await.unwrap();
+}