Step 1: 
Certainly! Here are five possible patches for the CWE-476 vulnerability in the given code snippet:

Patch 1:
```diff
@@ -10,6 +10,7 @@
 	if (IS_ERR(dir)) {
 		simple_recursive_removal(dir, NULL);
 		return PTR_ERR(dir);
+	} else if (!dir) {
 		pr_warn("QPIB: no directory for unit %u\n", dd->unit);
 	}
 	simple_recursive_removal(dir, NULL);

```

Patch 2:
```diff
@@ -10,6 +10,7 @@
 	if (IS_ERR(dir)) {
 		simple_recursive_removal(dir, NULL);
 		return PTR_ERR(dir);
+	} else if (!dir) {
 		pr_err("QPIB: no directory for unit %u\n", dd->unit);
 		return -ENOENT;
 	}

```

Patch 3:
```diff
@@ -10,6 +10,7 @@
 	if (IS_ERR(dir)) {
 		simple_recursive_removal(dir, NULL);
 		return PTR_ERR(dir);
+	} else if (!dir) {
 		pr_warn("QPIB: no directory for unit %u\n", dd->unit);
 		return -ENOENT;
 	}

```

Patch 4:
```diff
@@ -10,6 +10,7 @@
 	if (IS_ERR(dir)) {
 		simple_recursive_removal(dir, NULL);
 		return PTR_ERR(dir);
+	} else If (!dir) {
 		pr_err("QPIB: no directory for unit %u\n", dd->unit);
 		goto err;
 	}

```

Patch 5:
```diff
@@ -10,6 +10,7 @@
 	if (IS_ERR(dir)) {
 		simple_recursive_removal(dir, NULL);
 		return PTR_ERR(dir);
+	} else If (!dir) {
 		pr_err("QPIB: no directory for unit %u\n", dd->unit);
 		goto err;
 	}

```