Check index length.

src/main/java/net/schmizz/sshj/transport/verification/OpenSSHKnownHosts.java

@@ -200,7 +200,10 @@ public class OpenSSHKnownHosts
             if (marker != null) {
                 i++;
             }
-
+            if(split.length < 3) {
+                LOG.error("Error reading entry `{}`", line);
+                return null;
+            }
             final String hostnames = split[i++];
             final String sType = split[i++];
 

src/test/java/net/schmizz/sshj/transport/verification/OpenSSHKnownHostsTest.java

@@ -80,4 +80,9 @@ public class OpenSSHKnownHostsTest {
         assertTrue(kh.verify("69.163.155.180", 22, key));
     }
 
+    @Test
+    public void testVerifyIndexError() throws Exception {
+        final OpenSSHKnownHosts v = new OpenSSHKnownHosts(new File("src/test/resources/known_hosts.invalid"));
+        assertTrue(v.entries().isEmpty());
+    }
 }

src/test/resources/known_hosts.invalid

@@ -0,0 +1 @@
+M36Lo+Ik5ukNugvvoNFlpnyiHMmtKxt3FpyEfYuryXjNqMNWHn/ARVnpUIl5jRLTB7WBzyLYMG7X5nuoFL9zYqKGtHxChbDunxMVbspw5WXI9VN+qxcLwmITmpEvI9ApyS/Ox2ZyN7zw==