Re: [PATCH v1 net-next 06/11] ipv4: Convert RTM_DELADDR to per-netns RTNL.

[kernel test robot <lkp@intel.com>]

Hi Kuniyuki,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Kuniyuki-Iwashima/rtnetlink-Define-RTNL_FLAG_DOIT_PERNET-for-per-netns-RTNL-doit/20241018-092802
base:   net-next/main
patch link:    https://lore.kernel.org/r/20241018012225.90409-7-kuniyu%40amazon.com
patch subject: [PATCH v1 net-next 06/11] ipv4: Convert RTM_DELADDR to per-netns RTNL.
config: x86_64-randconfig-122-20241019 (https://download.01.org/0day-ci/archive/20241020/202410200600.GGC28WrU-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241020/202410200600.GGC28WrU-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410200600.GGC28WrU-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
>> net/ipv4/devinet.c:676:47: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void *p @@     got struct in_ifaddr [noderef] __rcu * @@
   net/ipv4/devinet.c:676:47: sparse:     expected void *p
   net/ipv4/devinet.c:676:47: sparse:     got struct in_ifaddr [noderef] __rcu *
   net/ipv4/devinet.c:946:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void *p @@     got struct in_ifaddr [noderef] __rcu *ifa_list @@
   net/ipv4/devinet.c:946:9: sparse:     expected void *p
   net/ipv4/devinet.c:946:9: sparse:     got struct in_ifaddr [noderef] __rcu *ifa_list
   net/ipv4/devinet.c:946:9: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void *p @@     got struct in_ifaddr [noderef] __rcu *ifa_next @@
   net/ipv4/devinet.c:946:9: sparse:     expected void *p
   net/ipv4/devinet.c:946:9: sparse:     got struct in_ifaddr [noderef] __rcu *ifa_next
   net/ipv4/devinet.c: note: in included file (through include/linux/inetdevice.h):
   include/linux/rtnetlink.h:147:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/rtnetlink.h:147:16: sparse:    void [noderef] __rcu *
   include/linux/rtnetlink.h:147:16: sparse:    void *
   include/linux/rtnetlink.h:147:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/rtnetlink.h:147:16: sparse:    void [noderef] __rcu *
   include/linux/rtnetlink.h:147:16: sparse:    void *
   include/linux/rtnetlink.h:147:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/rtnetlink.h:147:16: sparse:    void [noderef] __rcu *
   include/linux/rtnetlink.h:147:16: sparse:    void *
   include/linux/rtnetlink.h:147:16: sparse: sparse: incompatible types in comparison expression (different address spaces):
   include/linux/rtnetlink.h:147:16: sparse:    void [noderef] __rcu *
   include/linux/rtnetlink.h:147:16: sparse:    void *

vim +676 net/ipv4/devinet.c

   647	
   648	static int inet_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
   649				    struct netlink_ext_ack *extack)
   650	{
   651		struct net *net = sock_net(skb->sk);
   652		struct in_ifaddr __rcu **ifap;
   653		struct nlattr *tb[IFA_MAX+1];
   654		struct in_device *in_dev;
   655		struct ifaddrmsg *ifm;
   656		struct in_ifaddr *ifa;
   657		int err;
   658	
   659		err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
   660					     ifa_ipv4_policy, extack);
   661		if (err < 0)
   662			goto out;
   663	
   664		ifm = nlmsg_data(nlh);
   665	
   666		rtnl_net_lock(net);
   667	
   668		in_dev = inetdev_by_index(net, ifm->ifa_index);
   669		if (!in_dev) {
   670			NL_SET_ERR_MSG(extack, "ipv4: Device not found");
   671			err = -ENODEV;
   672			goto unlock;
   673		}
   674	
   675		for (ifap = &in_dev->ifa_list;
 > 676		     (ifa = rtnl_net_dereference(net, *ifap)) != NULL;
   677		     ifap = &ifa->ifa_next) {
   678			if (tb[IFA_LOCAL] &&
   679			    ifa->ifa_local != nla_get_in_addr(tb[IFA_LOCAL]))
   680				continue;
   681	
   682			if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
   683				continue;
   684	
   685			if (tb[IFA_ADDRESS] &&
   686			    (ifm->ifa_prefixlen != ifa->ifa_prefixlen ||
   687			    !inet_ifa_match(nla_get_in_addr(tb[IFA_ADDRESS]), ifa)))
   688				continue;
   689	
   690			if (ipv4_is_multicast(ifa->ifa_address))
   691				ip_mc_autojoin_config(net, false, ifa);
   692	
   693			__inet_del_ifa(in_dev, ifap, 1, nlh, NETLINK_CB(skb).portid);
   694			goto unlock;
   695		}
   696	
   697		NL_SET_ERR_MSG(extack, "ipv4: Address not found");
   698		err = -EADDRNOTAVAIL;
   699	unlock:
   700		rtnl_net_unlock(net);
   701	out:
   702		return err;
   703	}
   704	

-- 
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