The CWE-787 vulnerability in the provided code snippet is related to an out-of-bounds write that could occur if the `len` parameter exceeds the maximum value that can be safely handled, potentially leading to memory corruption. Here are five possible patches to address this vulnerability:

### Patch 1: Validate `len` Before Modification
Add a check to ensure that `len` does not exceed a safe threshold before modifying `skb->data` and `skb->len`.

```c
1 static inline void *__skb_push(struct sk_buff *skb, unsigned int len)
2 {
3     if (len > INT_MAX) {
4         printk(KERN_WARNING "skb_push: length exceeds INT_MAX, operation aborted.\n");
5         return NULL;
6     }
7 
8     skb->data -= len;
9     skb->len  += len;
10    return skb->data;
11 }
```

### Patch 2: Use Safe Arithmetic Operations
Utilize safe arithmetic operations to prevent integer overflow.

```c
1 #include <linux/overflow.h>
2 static inline void *__skb_push(struct sk_buff *skb, unsigned int len)
3 {
4     if (check_add_overflow(skb->len, len, &skb->len)) {
5         printk(KERN_WARNING "skb_push: integer overflow detected, operation aborted.\n");
6         return NULL;
7     }
8 
9     skb->data -= len;
10    return skb->data;
11 }
```

### Patch 3: Clamp `len` to `INT_MAX`
Explicitly clamp `len` to `INT_MAX` to prevent any overflow.

```c
1 static inline void *__skb_push(struct sk_buff *skb, unsigned int len)
2 {
3     len = min_t(unsigned int, len, INT_MAX);
4 
5     skb->data -= len;
6     skb->len  += len;
7     return skb->data;
8 }
```

### Patch 4: Return Error on Excessive Length
Return an error code or NULL if `len` exceeds `INT_MAX`.

```c
1 static inline void *__skb_push(struct sk_buff *skb, unsigned int len)
2 {
3     if (len > INT_MAX) {
4         printk(KERN_ERR "skb_push: length exceeds maximum allowable value.\n");
5         return NULL;
6     }
7 
8     skb->data -= len;
9     skb->len  += len;
10    return skb->data;
11 }
```

### Patch 5: Assert on Invalid Length
Use an assert to catch invalid `len` values during development.

```c
1 #include <linux/bug.h>
2 static inline void *__skb_push(struct sk_buff *skb, unsigned int len)
3 {
4     BUG_ON(len > INT_MAX);
5 
6     skb->data -= len;
7     skb->len  += len;
8     return skb->data;
9 }
```

Each of these patches aims to prevent the potential out-of-bounds write by ensuring that the `len` parameter does not exceed `INT_MAX`, thus maintaining the integrity of the memory operations on `skb`.