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authorAl Viro <viro@zeniv.linux.org.uk>2017-05-13 21:39:49 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2017-05-27 16:21:19 -0400
commit9ba3eb5103cf56f0daaf07de4507df76e7813ed7 (patch)
treed6766344879e985bf1226cf9534f6a8a9172f6f5 /arch/alpha/kernel
parent2ea659a9ef488125eb46da6eb571de5eae5c43f6 (diff)
downloadlinux-9ba3eb5103cf56f0daaf07de4507df76e7813ed7.tar.bz2
osf_getdomainname(): use copy_to_user()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/alpha/kernel')
-rw-r--r--arch/alpha/kernel/osf_sys.c23
1 files changed, 9 insertions, 14 deletions
diff --git a/arch/alpha/kernel/osf_sys.c b/arch/alpha/kernel/osf_sys.c
index 9ec56dc97374..c4e135db1704 100644
--- a/arch/alpha/kernel/osf_sys.c
+++ b/arch/alpha/kernel/osf_sys.c
@@ -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;
}
/*