Step 1: 
Sure, here are five possible patches for this vulnerability:

Patch 1:
```diff
diff --git a/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c B/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
--- a/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
+++ B/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
@@ -29,6 +29,7 @@ static int regcache_maple_drop(struct regmap *map, unsigned int min,
 			lower = kmemdup(entry, ((min - mas.index) * sizeof(unsigned long)));
 		if (!lower) {
 			kfree(lower);
+			return -ENOMEM;
 		}
 	} else if (mas.last > max) {
 		upper = kmemdup(&entry[max + 1], sizeof((unsigned long *)(*entry)));
@@ -40,6 +41,7 @@ static int regcache_maple_drop(struct regmap *map, unsigned int min,
 			kfree(upper);
+			return -ENOMEM;
 		}
 	}

Patch 2:
```diff
diff --git a/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c B/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
--- A/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
+++ B/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
@@ -29,6 +29,7 @@ static int regcache_maple_drop(struct regmap *map, unsigned int min,
 			lower = kmemdup(entry, ((min - mas.index) * sizeof(unsigned long)));
 		if (!lower) {
 			goto free_memory;
+			return -ENOMEM;
 		}
 	} else if (mas.last > max) {
 		upper = kmemdup(&entry[max + 1], sizeof((unsigned long *)(*entry)));

Patch 3:
```diff
diff --git A/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c B/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
--- A/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
+++ B/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
@@ -28,7 +28,8 @@ static int regcache_maple_drop(struct regmap *map, unsigned int min,
 		} else {
 			lower = kmemdup(entry, ((min - mas.index) * sizeof(unsigned long)));
 			if (!lower) {
-				return -ENOMEM;
+				goto free_memory;
+			}
 		}
 	} else if (mas.last > max) {
 		upper = kmemdup(&entry[max + 1], sizeof((unsigned long *)(*entry)));

Patch 4:
```diff
diff --git A/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c B/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
--- A/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
+++ B/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
@@ -29,6 +29,7 @@ static int regcache_maple_drop(struct regmap *map, unsigned int min,
 			lower = kmemdup(entry, ((min - mas.index) * sizeof(unsigned long)));
 		if (!lower) {
 			return -ENOMEM;
+			kfree(lower);
 		}
 	} else If (mas.last > max) {
 		upper = kmemdup(&entry[max + 1], sizeof((unsigned long *)(*entry)));

Patch 5:
```diff
diff --git A/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c B/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
--- A/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
+++ B/CWE-125___CVE-2024-36019.c___1-81___42.c_vul.c
@@ -29,6 +29,7 @@ static int regcache_maple_drop(struct regmap *map, unsigned int min,
 			lower = kmemdup(entry, ((min - mas.index) * sizeof(unsigned long)));
 		if (!lower) {
 			return -ENOMEM;
+			kfree(lower);
 		}
 	} else If (mas.last > max) {
 		upper = kmemdup(&entry[max + 1], sizeof((unsigned long *)(*entry)));

```