Here are five possible patches to address the CWE-457  vulnerability in the given code:

Patch 1:
```c
7 	spin_lock_irqsave(shost->host_lock, iflags);
8 	ndlp = __lpfc_findnode_did(vport, did);
9 	if (ndlp)
10 		get_device(&ndlp->dev);
11 	spin_unlock_irqrestore(shost->host_lock, iflags);
12 	return ndlp;
```

Patch 2:
```c
7 	spin_lock_irqsave(shost->host_lock, iflags);
8 	ndlp = __lpfc_findnode_did(vport, did);
9 	if (ndlp)
10 		kref_get(&ndlp->kref);
11 	spin_unlock_irqrestore(shost->host_lock, iflags);
12 	return ndlp;
```

Patch 3:
```c
7 	spin_lock_irqsave(shost->host_lock, iflags);
8 	ndlp = __lpfc_findnode_did(vport, did);
9 	spin_unlock_irqrestore(shost->host_lock, iflags);
10 	if (ndlp) {
11 		spin_lock_irqsave(shost->host_lock, iflags);
12 		if (ndlp->nlp_state != NLP_STE_FREED_NODE) {
13 			spin_unlock_irqrestore(shost->host_lock, iflags);
14 			return ndlp;
15 		}
16 		spin_unlock_irqrestore(shost->host_lock, iflags);
17 	}
18 	return NULL;
```

Patch 4:
```c
7 	struct lpfc_nodelist *result = NULL;
8 	spin_lock_irqsave(shost->host_lock, iflags);
9 	ndlp = __lpfc_findnode_did(vport, did);
10 	if (ndlp && ndlp->nlp_state != NLP_STE_FREED_NODE)
11 		result = ndlp;
12 	spin_unlock_irqrestore(shost->host_lock, iflags);
13 	return result;
```

Patch 5:
```c
7 	spin_lock_irqsave(shost->host_lock, iflags);
8 	ndlp = __lpfc_findnode_did(vport, did);
9 	if (ndlp) {
10 		atomic_inc(&ndlp->ref_count);
11 		spin_unlock_irqrestore(shost->host_lock, iflags);
12 		return ndlp;
13 	}
14 	spin_unlock_irqrestore(shost->host_lock, iflags);
15 	return NULL;
```

These patches aim to prevent the use-after-free vulnerability by either increasing the reference count of the found node, checking its state before returning, or using atomic operations to ensure the node is still valid after releasing the lock.