tree: https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git to-build head: 5fd3eccb73a30251d944935959498ca308848a54 commit: 382f957e43c56b6accc080efa5da678d8067ebf8 [31/41] ip_tunnel: use ndo_siocdevprivate config: x86_64-randconfig-a003-20210517 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 0a34ff8bcb1df16fe7d643ccbe4567b2162c5024) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commi... git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git git fetch --no-tags arnd-playground to-build git checkout 382f957e43c56b6accc080efa5da678d8067ebf8 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): vim +1614 net/ipv6/ip6_tunnel.c c12b395a46646b xeb(a)mail.ru 2012-08-10 1581 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1582 /** 3144581cb0b4b1 Yasuyuki Kozakai 2007-02-10 1583 * ip6_tnl_ioctl - configure ipv6 tunnels from userspace ^1da177e4c3f41 Linus Torvalds 2005-04-16 1584 * @dev: virtual device associated with tunnel 382f957e43c56b Arnd Bergmann 2020-11-05 1585 * @ifr: unused 382f957e43c56b Arnd Bergmann 2020-11-05 1586 * @data: parameters passed from userspace ^1da177e4c3f41 Linus Torvalds 2005-04-16 1587 * @cmd: command to be performed ^1da177e4c3f41 Linus Torvalds 2005-04-16 1588 * ^1da177e4c3f41 Linus Torvalds 2005-04-16 1589 * Description: 3144581cb0b4b1 Yasuyuki Kozakai 2007-02-10 1590 * ip6_tnl_ioctl() is used for managing IPv6 tunnels ^1da177e4c3f41 Linus Torvalds 2005-04-16 1591 * from userspace. ^1da177e4c3f41 Linus Torvalds 2005-04-16 1592 * ^1da177e4c3f41 Linus Torvalds 2005-04-16 1593 * The possible commands are the following: ^1da177e4c3f41 Linus Torvalds 2005-04-16 1594 * %SIOCGETTUNNEL: get tunnel parameters for device ^1da177e4c3f41 Linus Torvalds 2005-04-16 1595 * %SIOCADDTUNNEL: add tunnel matching given tunnel parameters ^1da177e4c3f41 Linus Torvalds 2005-04-16 1596 * %SIOCCHGTUNNEL: change tunnel parameters to those given ^1da177e4c3f41 Linus Torvalds 2005-04-16 1597 * %SIOCDELTUNNEL: delete tunnel ^1da177e4c3f41 Linus Torvalds 2005-04-16 1598 * ^1da177e4c3f41 Linus Torvalds 2005-04-16 1599 * The fallback device "ip6tnl0", created during module ^1da177e4c3f41 Linus Torvalds 2005-04-16 1600 * initialization, can be used for creating other tunnel devices. ^1da177e4c3f41 Linus Torvalds 2005-04-16 1601 * ^1da177e4c3f41 Linus Torvalds 2005-04-16 1602 * Return: ^1da177e4c3f41 Linus Torvalds 2005-04-16 1603 * 0 on success, ^1da177e4c3f41 Linus Torvalds 2005-04-16 1604 * %-EFAULT if unable to copy data to or from userspace, ^1da177e4c3f41 Linus Torvalds 2005-04-16 1605 * %-EPERM if current process hasn't %CAP_NET_ADMIN set ^1da177e4c3f41 Linus Torvalds 2005-04-16 1606 * %-EINVAL if passed tunnel parameters are invalid, ^1da177e4c3f41 Linus Torvalds 2005-04-16 1607 * %-EEXIST if changing a tunnel's parameters would cause a conflict ^1da177e4c3f41 Linus Torvalds 2005-04-16 1608 * %-ENODEV if attempting to change or delete a nonexisting device ^1da177e4c3f41 Linus Torvalds 2005-04-16 1609 **/ ^1da177e4c3f41 Linus Torvalds 2005-04-16 1610 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1611 static int 382f957e43c56b Arnd Bergmann 2020-11-05 1612 ip6_tnl_siocdevprivate(struct net_device *dev, struct ifreq *ifr, 382f957e43c56b Arnd Bergmann 2020-11-05 1613 void __user *data, int cmd) ^1da177e4c3f41 Linus Torvalds 2005-04-16 @1614 { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1615 int err = 0; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1616 struct ip6_tnl_parm p; c12b395a46646b xeb(a)mail.ru 2012-08-10 1617 struct __ip6_tnl_parm p1; 74462f0d4a7342 Nicolas Dichtel 2014-04-16 1618 struct ip6_tnl *t = netdev_priv(dev); 74462f0d4a7342 Nicolas Dichtel 2014-04-16 1619 struct net *net = t->net; 2dd02c897d798c Pavel Emelyanov 2008-04-16 1620 struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1621 0d3c703a9d1723 Tom Herbert 2016-04-29 1622 memset(&p1, 0, sizeof(p1)); 0d3c703a9d1723 Tom Herbert 2016-04-29 1623 ^1da177e4c3f41 Linus Torvalds 2005-04-16 1624 switch (cmd) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1625 case SIOCGETTUNNEL: 15820e129013dd Pavel Emelyanov 2008-04-16 1626 if (dev == ip6n->fb_tnl_dev) { 382f957e43c56b Arnd Bergmann 2020-11-05 1627 if (copy_from_user(&p, data, sizeof(p))) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1628 err = -EFAULT; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1629 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1630 } c12b395a46646b xeb(a)mail.ru 2012-08-10 1631 ip6_tnl_parm_from_user(&p1, &p); c12b395a46646b xeb(a)mail.ru 2012-08-10 1632 t = ip6_tnl_locate(net, &p1, 0); 37355565ba57fd Nicolas Dichtel 2015-03-16 1633 if (IS_ERR(t)) 74462f0d4a7342 Nicolas Dichtel 2014-04-16 1634 t = netdev_priv(dev); 5ef5d6c569f80c Dan Carpenter 2012-08-16 1635 } else { 5ef5d6c569f80c Dan Carpenter 2012-08-16 1636 memset(&p, 0, sizeof(p)); 567131a722ca06 Ville Nuorvala 2006-11-24 1637 } c12b395a46646b xeb(a)mail.ru 2012-08-10 1638 ip6_tnl_parm_to_user(&p, &t->parms); 382f957e43c56b Arnd Bergmann 2020-11-05 1639 if (copy_to_user(data, &p, sizeof(p))) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1640 err = -EFAULT; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1641 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1642 case SIOCADDTUNNEL: ^1da177e4c3f41 Linus Torvalds 2005-04-16 1643 case SIOCCHGTUNNEL: ^1da177e4c3f41 Linus Torvalds 2005-04-16 1644 err = -EPERM; af31f412c7c7a3 Eric W. Biederman 2012-11-16 1645 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1646 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1647 err = -EFAULT; 382f957e43c56b Arnd Bergmann 2020-11-05 1648 if (copy_from_user(&p, data, sizeof(p))) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1649 break; 567131a722ca06 Ville Nuorvala 2006-11-24 1650 err = -EINVAL; 502b093569e48d Yasuyuki Kozakai 2006-11-30 1651 if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP && 502b093569e48d Yasuyuki Kozakai 2006-11-30 1652 p.proto != 0) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1653 break; c12b395a46646b xeb(a)mail.ru 2012-08-10 1654 ip6_tnl_parm_from_user(&p1, &p); c12b395a46646b xeb(a)mail.ru 2012-08-10 1655 t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL); acf722f73499d8 Alexey Andriyanov 2014-10-29 1656 if (cmd == SIOCCHGTUNNEL) { 37355565ba57fd Nicolas Dichtel 2015-03-16 1657 if (!IS_ERR(t)) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1658 if (t->dev != dev) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1659 err = -EEXIST; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1660 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1661 } 567131a722ca06 Ville Nuorvala 2006-11-24 1662 } else 567131a722ca06 Ville Nuorvala 2006-11-24 1663 t = netdev_priv(dev); acf722f73499d8 Alexey Andriyanov 2014-10-29 1664 if (dev == ip6n->fb_tnl_dev) acf722f73499d8 Alexey Andriyanov 2014-10-29 1665 err = ip6_tnl0_update(t, &p1); acf722f73499d8 Alexey Andriyanov 2014-10-29 1666 else 0b112457229d8a Nicolas Dichtel 2012-11-14 1667 err = ip6_tnl_update(t, &p1); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1668 } 37355565ba57fd Nicolas Dichtel 2015-03-16 1669 if (!IS_ERR(t)) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1670 err = 0; c12b395a46646b xeb(a)mail.ru 2012-08-10 1671 ip6_tnl_parm_to_user(&p, &t->parms); 382f957e43c56b Arnd Bergmann 2020-11-05 1672 if (copy_to_user(data, &p, sizeof(p))) 567131a722ca06 Ville Nuorvala 2006-11-24 1673 err = -EFAULT; 567131a722ca06 Ville Nuorvala 2006-11-24 1674 37355565ba57fd Nicolas Dichtel 2015-03-16 1675 } else { 37355565ba57fd Nicolas Dichtel 2015-03-16 1676 err = PTR_ERR(t); 37355565ba57fd Nicolas Dichtel 2015-03-16 1677 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1678 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1679 case SIOCDELTUNNEL: ^1da177e4c3f41 Linus Torvalds 2005-04-16 1680 err = -EPERM; af31f412c7c7a3 Eric W. Biederman 2012-11-16 1681 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1682 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1683 15820e129013dd Pavel Emelyanov 2008-04-16 1684 if (dev == ip6n->fb_tnl_dev) { ^1da177e4c3f41 Linus Torvalds 2005-04-16 1685 err = -EFAULT; 382f957e43c56b Arnd Bergmann 2020-11-05 1686 if (copy_from_user(&p, data, sizeof(p))) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1687 break; 567131a722ca06 Ville Nuorvala 2006-11-24 1688 err = -ENOENT; c12b395a46646b xeb(a)mail.ru 2012-08-10 1689 ip6_tnl_parm_from_user(&p1, &p); c12b395a46646b xeb(a)mail.ru 2012-08-10 1690 t = ip6_tnl_locate(net, &p1, 0); 37355565ba57fd Nicolas Dichtel 2015-03-16 1691 if (IS_ERR(t)) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1692 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1693 err = -EPERM; 15820e129013dd Pavel Emelyanov 2008-04-16 1694 if (t->dev == ip6n->fb_tnl_dev) ^1da177e4c3f41 Linus Torvalds 2005-04-16 1695 break; 567131a722ca06 Ville Nuorvala 2006-11-24 1696 dev = t->dev; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1697 } 22f8cde5bc336f Stephen Hemminger 2007-02-07 1698 err = 0; 22f8cde5bc336f Stephen Hemminger 2007-02-07 1699 unregister_netdevice(dev); ^1da177e4c3f41 Linus Torvalds 2005-04-16 1700 break; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1701 default: ^1da177e4c3f41 Linus Torvalds 2005-04-16 1702 err = -EINVAL; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1703 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1704 return err; ^1da177e4c3f41 Linus Torvalds 2005-04-16 1705 } ^1da177e4c3f41 Linus Torvalds 2005-04-16 1706 :::::: The code at line 1614 was first introduced by commit :::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2 :::::: TO: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; :::::: CC: Linus Torvalds <torvalds(a)ppc970.osdl.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org