}
EXPORT_SYMBOL(kzfree);
-int kern_ptr_validate(const void *ptr, unsigned long size)
-{
- unsigned long addr = (unsigned long)ptr;
- unsigned long min_addr = PAGE_OFFSET;
- unsigned long align_mask = sizeof(void *) - 1;
-
- if (unlikely(addr < min_addr))
- goto out;
- if (unlikely(addr > (unsigned long)high_memory - size))
- goto out;
- if (unlikely(addr & align_mask))
- goto out;
- if (unlikely(!kern_addr_valid(addr)))
- goto out;
- if (unlikely(!kern_addr_valid(addr + size - 1)))
- goto out;
- return 1;
-out:
- return 0;
-}
-
/*
* strndup_user - duplicate an existing string from user space
* @s: The string to duplicate