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osf_getdomainname(): use copy_to_user()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-05-13 21:39:49 -04:00
parent 2ea659a9ef
commit 9ba3eb5103
1 changed files with 9 additions and 14 deletions
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23
arch/alpha/kernel/osf_sys.c
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@ -564,25 +564,20 @@ SYSCALL_DEFINE0(getdtablesize)
*/
SYSCALL_DEFINE2(osf_getdomainname, char __user *, name, int, namelen)
{
unsigned len;
int i;
int len, err = 0;
char *kname;
if (!access_ok(VERIFY_WRITE, name, namelen))
return -EFAULT;
len = namelen;
if (len > 32)
len = 32;
if (namelen > 32)
namelen = 32;
down_read(&uts_sem);
for (i = 0; i < len; ++i) {
__put_user(utsname()->domainname[i], name + i);
if (utsname()->domainname[i] == '\0')
break;
}
kname = utsname()->domainname;
len = strnlen(kname, namelen);
if (copy_to_user(name, kname, min(len + 1, namelen)))
err = -EFAULT;
up_read(&uts_sem);
return 0;
return err;
}
/*