c
static inline bool skb_can_push(struct sk_buff *skb, unsigned int len)
{
    return (len <= INT_MAX && len <= skb->data - skb->head);
}

static inline void *__skb_push(struct sk_buff *skb, unsigned int len)
{
    if (!skb_can_push(skb, len)) {
        pr_err("__skb_push: cannot safely push data\n");
        return NULL;
    }
    // ... rest of the function
}
