Q: Given the following code slice:
```
1 static int regcache_maple_drop(struct regmap *map, unsigned int min,
2 			       unsigned int max)
3 {
4 	struct maple_tree *mt = map->cache;
5 	MA_STATE(mas, mt, min, max);
6 	unsigned long *entry, *lower, *upper;
7 	unsigned long lower_index, lower_last;
8 	unsigned long upper_index, upper_last;
9 	int ret;
10 
11 	lower = NULL;
12 	upper = NULL;
13 
14 	mas_lock(&mas);
15 
16 	mas_for_each(&mas, entry, max) {
17 		/*
18 		 * This is safe because the regmap lock means the
19 		 * Maple lock is redundant, but we need to take it due
20 		 * to lockdep asserts in the maple tree code.
21 		 */
22 		mas_unlock(&mas);
23 
24 		/* Do we need to save any of this entry? */
25 		if (mas.index < min) {
26 			lower_index = mas.index;
27 			lower_last = min -1;
28 
29 			lower = kmemdup(entry, ((min - mas.index) *
30 						sizeof(unsigned long)),
31 					map->alloc_flags);
32 			if (!lower) {
33 				ret = -ENOMEM;
34 				goto out_unlocked;
35 			}
36 		}
37 
38 		if (mas.last > max) {
39 			upper_index = max + 1;
40 			upper_last = mas.last;
41 
42 			upper = kmemdup(&entry[max + 1],
43 					((mas.last - max) *
44 					 sizeof(unsigned long)),
45 					map->alloc_flags);
46 			if (!upper) {
47 				ret = -ENOMEM;
48 				goto out_unlocked;
49 			}
50 		}
51 
52 		kfree(entry);
53 		mas_lock(&mas);
54 		mas_erase(&mas);
55 
56 		/* Insert new nodes with the saved data */
57 		if (lower) {
58 			mas_set_range(&mas, lower_index, lower_last);
59 			ret = mas_store_gfp(&mas, lower, map->alloc_flags);
60 			if (ret != 0)
61 				goto out;
62 			lower = NULL;
63 		}
64 
65 		if (upper) {
66 			mas_set_range(&mas, upper_index, upper_last);
67 			ret = mas_store_gfp(&mas, upper, map->alloc_flags);
68 			if (ret != 0)
69 				goto out;
70 			upper = NULL;
71 		}
72 	}
73 
74 out:
75 	mas_unlock(&mas);
76 out_unlocked:
77 	kfree(lower);
78 	kfree(upper);
79 
80 	return ret;
81 }
```
which has a vulnerability among CWE-125 and among lines:
```
42 			upper = kmemdup(&entry[max + 1],
```
Please generate five possible patches for the vulnerability.