blob: ace2aea69f1a834ca7526a1bfa4070205b82579e [file] [log] [blame]
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/module.h>
#include <linux/err.h>
#include <asm/uaccess.h>
* __kzalloc - allocate memory. The memory is set to zero.
* @size: how many bytes of memory are required.
* @flags: the type of memory to allocate.
void *__kzalloc(size_t size, gfp_t flags)
void *ret = kmalloc_track_caller(size, flags);
if (ret)
memset(ret, 0, size);
return ret;
* kstrdup - allocate space for and copy an existing string
* @s: the string to duplicate
* @gfp: the GFP mask used in the kmalloc() call when allocating memory
char *kstrdup(const char *s, gfp_t gfp)
size_t len;
char *buf;
if (!s)
return NULL;
len = strlen(s) + 1;
buf = kmalloc_track_caller(len, gfp);
if (buf)
memcpy(buf, s, len);
return buf;
* kmemdup - duplicate region of memory
* @src: memory region to duplicate
* @len: memory region length
* @gfp: GFP mask to use
void *kmemdup(const void *src, size_t len, gfp_t gfp)
void *p;
p = kmalloc_track_caller(len, gfp);
if (p)
memcpy(p, src, len);
return p;
* strndup_user - duplicate an existing string from user space
* @s: The string to duplicate
* @n: Maximum number of bytes to copy, including the trailing NUL.
char *strndup_user(const char __user *s, long n)
char *p;
long length;
length = strnlen_user(s, n);
if (!length)
return ERR_PTR(-EFAULT);
if (length > n)
return ERR_PTR(-EINVAL);
p = kmalloc(length, GFP_KERNEL);
if (!p)
return ERR_PTR(-ENOMEM);
if (copy_from_user(p, s, length)) {
return ERR_PTR(-EFAULT);
p[length - 1] = '\0';
return p;