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Message-ID: <202410111515.TbOH4hSS-lkp@intel.com>
Date: Fri, 11 Oct 2024 15:36:55 +0800
From: kernel test robot <lkp@...el.com>
To: Kuniyuki Iwashima <kuniyu@...zon.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
netdev@...r.kernel.org, Kuniyuki Iwashima <kuniyu@...zon.com>
Subject: Re: [PATCH v1 net-next 12/13] rtnetlink: Call
rtnl_link_get_net_capable() in do_setlink().
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-Allocate-linkinfo-as-struct-rtnl_newlink_tbs/20241010-072158
base: net-next/main
patch link: https://lore.kernel.org/r/20241009231656.57830-13-kuniyu%40amazon.com
patch subject: [PATCH v1 net-next 12/13] rtnetlink: Call rtnl_link_get_net_capable() in do_setlink().
config: x86_64-buildonly-randconfig-003-20241011 (https://download.01.org/0day-ci/archive/20241011/202410111515.TbOH4hSS-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20241011/202410111515.TbOH4hSS-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202410111515.TbOH4hSS-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> net/core/rtnetlink.c:3281:6: warning: variable 'tgt_net' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
3281 | if (err < 0)
| ^~~~~~~
net/core/rtnetlink.c:3301:10: note: uninitialized use occurs here
3301 | put_net(tgt_net);
| ^~~~~~~
net/core/rtnetlink.c:3281:2: note: remove the 'if' if its condition is always false
3281 | if (err < 0)
| ^~~~~~~~~~~~
3282 | goto errout;
| ~~~~~~~~~~~
net/core/rtnetlink.c:3277:6: warning: variable 'tgt_net' is used uninitialized whenever 'if' condition is true [-Wsometimes-uninitialized]
3277 | if (err < 0)
| ^~~~~~~
net/core/rtnetlink.c:3301:10: note: uninitialized use occurs here
3301 | put_net(tgt_net);
| ^~~~~~~
net/core/rtnetlink.c:3277:2: note: remove the 'if' if its condition is always false
3277 | if (err < 0)
| ^~~~~~~~~~~~
3278 | goto errout;
| ~~~~~~~~~~~
net/core/rtnetlink.c:3272:21: note: initialize the variable 'tgt_net' to silence this warning
3272 | struct net *tgt_net;
| ^
| = NULL
2 warnings generated.
vim +3281 net/core/rtnetlink.c
cc6090e985d7d6 Jiri Pirko 2019-09-30 3264
c21ef3e343ae91 David Ahern 2017-04-16 3265 static int rtnl_setlink(struct sk_buff *skb, struct nlmsghdr *nlh,
c21ef3e343ae91 David Ahern 2017-04-16 3266 struct netlink_ext_ack *extack)
0157f60c0caea2 Patrick McHardy 2007-06-13 3267 {
3a6cb17da69fbf Kuniyuki Iwashima 2024-10-09 3268 struct ifinfomsg *ifm = nlmsg_data(nlh);
3b1e0a655f8eba YOSHIFUJI Hideaki 2008-03-26 3269 struct net *net = sock_net(skb->sk);
0157f60c0caea2 Patrick McHardy 2007-06-13 3270 struct nlattr *tb[IFLA_MAX+1];
3a6cb17da69fbf Kuniyuki Iwashima 2024-10-09 3271 struct net_device *dev = NULL;
b27f78e2575aa2 Kuniyuki Iwashima 2024-10-09 3272 struct net *tgt_net;
3a6cb17da69fbf Kuniyuki Iwashima 2024-10-09 3273 int err;
0157f60c0caea2 Patrick McHardy 2007-06-13 3274
8cb081746c031f Johannes Berg 2019-04-26 3275 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFLA_MAX,
8cb081746c031f Johannes Berg 2019-04-26 3276 ifla_policy, extack);
0157f60c0caea2 Patrick McHardy 2007-06-13 3277 if (err < 0)
0157f60c0caea2 Patrick McHardy 2007-06-13 3278 goto errout;
0157f60c0caea2 Patrick McHardy 2007-06-13 3279
4ff66cae7f10b6 Christian Brauner 2018-02-07 3280 err = rtnl_ensure_unique_netns(tb, extack, false);
4ff66cae7f10b6 Christian Brauner 2018-02-07 @3281 if (err < 0)
4ff66cae7f10b6 Christian Brauner 2018-02-07 3282 goto errout;
4ff66cae7f10b6 Christian Brauner 2018-02-07 3283
b27f78e2575aa2 Kuniyuki Iwashima 2024-10-09 3284 tgt_net = rtnl_link_get_net_capable(skb, net, tb, CAP_NET_ADMIN);
b27f78e2575aa2 Kuniyuki Iwashima 2024-10-09 3285 if (IS_ERR(tgt_net))
b27f78e2575aa2 Kuniyuki Iwashima 2024-10-09 3286 return PTR_ERR(tgt_net);
b27f78e2575aa2 Kuniyuki Iwashima 2024-10-09 3287
0157f60c0caea2 Patrick McHardy 2007-06-13 3288 if (ifm->ifi_index > 0)
a3d1289126e7b1 Eric Dumazet 2009-10-21 3289 dev = __dev_get_by_index(net, ifm->ifi_index);
76c9ac0ee878f6 Jiri Pirko 2019-09-30 3290 else if (tb[IFLA_IFNAME] || tb[IFLA_ALT_IFNAME])
5ea08b5286f66e Florent Fourcot 2022-04-15 3291 dev = rtnl_dev_get(net, tb);
0157f60c0caea2 Patrick McHardy 2007-06-13 3292 else
3a6cb17da69fbf Kuniyuki Iwashima 2024-10-09 3293 err = -EINVAL;
0157f60c0caea2 Patrick McHardy 2007-06-13 3294
3a6cb17da69fbf Kuniyuki Iwashima 2024-10-09 3295 if (dev)
b27f78e2575aa2 Kuniyuki Iwashima 2024-10-09 3296 err = do_setlink(skb, dev, tgt_net, ifm, extack, tb, 0);
3a6cb17da69fbf Kuniyuki Iwashima 2024-10-09 3297 else if (!err)
0157f60c0caea2 Patrick McHardy 2007-06-13 3298 err = -ENODEV;
0157f60c0caea2 Patrick McHardy 2007-06-13 3299
da5e0494c542dd Thomas Graf 2006-08-10 3300 errout:
b27f78e2575aa2 Kuniyuki Iwashima 2024-10-09 3301 put_net(tgt_net);
b27f78e2575aa2 Kuniyuki Iwashima 2024-10-09 3302
^1da177e4c3f41 Linus Torvalds 2005-04-16 3303 return err;
^1da177e4c3f41 Linus Torvalds 2005-04-16 3304 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 3305
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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