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osf_getdomainname(): use copy_to_user()

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commit 9ba3eb5103cf56f0daaf07de4507df76e7813ed7 upstream.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Al Viro 2017-05-13 21:39:49 -04:00 • committed by Greg Kroah-Hartman
parent d792799caa
commit 1a9bc340b8
1 changed files with 9 additions and 14 deletions
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23
arch/alpha/kernel/osf_sys.c
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@ -561,25 +561,20 @@ SYSCALL_DEFINE0(getdtablesize)
*/ */
SYSCALL_DEFINE2(osf_getdomainname, char __user *, name, int, namelen) SYSCALL_DEFINE2(osf_getdomainname, char __user *, name, int, namelen)
{ {
unsigned len; int len, err = 0;
int i; char *kname;
if (!access_ok(VERIFY_WRITE, name, namelen)) if (namelen > 32)
return -EFAULT; namelen = 32;
len = namelen;
if (len > 32)
len = 32;
down_read(&uts_sem); down_read(&uts_sem);
for (i = 0; i < len; ++i) { kname = utsname()->domainname;
__put_user(utsname()->domainname[i], name + i); len = strnlen(kname, namelen);
if (utsname()->domainname[i] == '\0') if (copy_to_user(name, kname, min(len + 1, namelen)))
break; err = -EFAULT;
}
up_read(&uts_sem); up_read(&uts_sem);
return 0; return err;
} }
/* /*