c
static inline void *__skb_push(struct sk_buff *skb, unsigned int len)
{
    if (len > INT_MAX || len > skb->data - skb->head || 
        len + skb->len > SKB_MAX_ALLOC) {
        pr_err("__skb_push: invalid length or insufficient space\n");
        return NULL;
    }
    // ... rest of the function
}
