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kernel/sysctl_binary.c: use generic UUID library 

UUID library provides uuid_be type and uuid_be_to_bin() function.  This
substitutes open coded variant by generic library calls.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andy Shevchenko 2016-05-20 17:01:10 -07:00 committed by Linus Torvalds
parent e3a93bce69
commit ede9c27749
1 changed files with 7 additions and 16 deletions
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23
kernel/sysctl_binary.c
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@ -13,6 +13,7 @@
#include <linux/ctype.h>
#include <linux/netdevice.h>
#include <linux/kernel.h>
#include <linux/uuid.h>
#include <linux/slab.h>
#include <linux/compat.h>
@ -1117,9 +1118,8 @@ static ssize_t bin_uuid(struct file *file,
/* Only supports reads */
if (oldval && oldlen) {
char buf[40], *str = buf;
unsigned char uuid[16];
int i;
char buf[UUID_STRING_LEN + 1];
uuid_be uuid;
result = kernel_read(file, 0, buf, sizeof(buf) - 1);
if (result < 0)
@ -1127,24 +1127,15 @@ static ssize_t bin_uuid(struct file *file,
buf[result] = '\0';
/* Convert the uuid to from a string to binary */
for (i = 0; i < 16; i++) {
result = -EIO;
if (!isxdigit(str[0]) || !isxdigit(str[1]))
goto out;
uuid[i] = (hex_to_bin(str[0]) << 4) |
hex_to_bin(str[1]);
str += 2;
if (*str == '-')
str++;
}
result = -EIO;
if (uuid_be_to_bin(buf, &uuid))
goto out;
if (oldlen > 16)
oldlen = 16;
result = -EFAULT;
if (copy_to_user(oldval, uuid, oldlen))
if (copy_to_user(oldval, &uuid, oldlen))
goto out;
copied = oldlen;