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Date: Tue, 28 Feb 2017 14:16:57 +0800
From: kbuild test robot <lkp@...el.com>
To: Cong Wang <xiyou.wangcong@...il.com>
Cc: kbuild-all@...org, netdev@...r.kernel.org, andreyknvl@...gle.com,
Cong Wang <xiyou.wangcong@...il.com>,
David Ahern <dsa@...ulusnetworks.com>,
Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [Patch net v2] ipv6: check for ip6_null_entry in
__ip6_del_rt_siblings()
Hi Cong,
[auto build test WARNING on net/master]
url: https://github.com/0day-ci/linux/commits/Cong-Wang/ipv6-check-for-ip6_null_entry-in-__ip6_del_rt_siblings/20170228-135206
config: x86_64-randconfig-x017-201709 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings
All warnings (new ones prefixed by >>):
Cyclomatic Complexity 3 include/net/sock.h:lockdep_sock_is_held
Cyclomatic Complexity 5 include/net/sock.h:__sk_dst_get
Cyclomatic Complexity 6 include/net/sock.h:sock_owned_by_me
Cyclomatic Complexity 1 include/net/sock.h:sock_owned_by_user
Cyclomatic Complexity 5 include/net/addrconf.h:__in6_dev_get
Cyclomatic Complexity 11 net/ipv6/route.c:rt6_mtu_change_route
Cyclomatic Complexity 4 net/ipv6/route.c:ip6_mtu
Cyclomatic Complexity 3 include/net/neighbour.h:__neigh_lookup
Cyclomatic Complexity 2 include/net/neighbour.h:neigh_release
Cyclomatic Complexity 2 net/ipv6/route.c:ip6_print_replace_route_err
Cyclomatic Complexity 6 net/ipv6/route.c:ip6_pkt_drop
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_pkt_discard
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_pkt_discard_out
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_pkt_prohibit
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_pkt_prohibit_out
Cyclomatic Complexity 12 net/ipv6/route.c:ip6_convert_metrics
Cyclomatic Complexity 7 net/ipv6/route.c:ip6_route_info_append
Cyclomatic Complexity 3 net/ipv6/route.c:__ip6_del_rt
Cyclomatic Complexity 2 arch/x86/include/asm/uaccess.h:copy_user_overflow
Cyclomatic Complexity 2 net/ipv6/route.c:rt6_nlmsg_size
Cyclomatic Complexity 1 include/linux/skbuff.h:alloc_skb
Cyclomatic Complexity 1 include/net/netlink.h:nlmsg_new
Cyclomatic Complexity 2 include/net/netlink.h:nlmsg_put
Cyclomatic Complexity 5 include/net/ip6_route.h:ip6_route_get_saddr
Cyclomatic Complexity 1 include/net/netlink.h:nla_put_in6_addr
Cyclomatic Complexity 1 include/net/netlink.h:nla_put_u32
Cyclomatic Complexity 2 include/net/netlink.h:nla_nest_start
Cyclomatic Complexity 1 include/net/netlink.h:nla_put_u8
Cyclomatic Complexity 10 net/ipv6/route.c:rt6_nexthop_info
Cyclomatic Complexity 4 net/ipv6/route.c:rt6_add_nexthop
Cyclomatic Complexity 3 include/net/netlink.h:nlmsg_trim
Cyclomatic Complexity 1 include/net/netlink.h:nlmsg_cancel
Cyclomatic Complexity 38 net/ipv6/route.c:rt6_fill_node
Cyclomatic Complexity 10 net/ipv6/route.c:__ip6_del_rt_siblings
Cyclomatic Complexity 16 net/ipv6/route.c:ip6_route_del
Cyclomatic Complexity 6 net/ipv6/route.c:ip6_dst_gc
Cyclomatic Complexity 2 net/ipv6/route.c:ipv6_sysctl_rtcache_flush
Cyclomatic Complexity 5 net/ipv6/route.c:ip6_route_net_init
Cyclomatic Complexity 2 include/net/netlink.h:nlmsg_parse
Cyclomatic Complexity 1 include/net/netlink.h:nla_get_in6_addr
Cyclomatic Complexity 24 net/ipv6/route.c:rtm_to_fib6_config
Cyclomatic Complexity 6 net/ipv6/route.c:ip6_route_multipath_del
Cyclomatic Complexity 3 net/ipv6/route.c:inet6_rtm_delroute
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_route_net_exit_late
Cyclomatic Complexity 1 net/ipv6/route.c:rt6_stats_seq_open
Cyclomatic Complexity 1 net/ipv6/route.c:rt6_stats_seq_show
Cyclomatic Complexity 1 include/linux/proc_fs.h:proc_create
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_route_net_init_late
Cyclomatic Complexity 1 net/ipv6/route.c:ipv6_inetpeer_exit
Cyclomatic Complexity 2 net/ipv6/route.c:ipv6_inetpeer_init
Cyclomatic Complexity 4 net/ipv6/route.c:ip6_dst_alloc
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_route_lookup
Cyclomatic Complexity 3 net/ipv6/route.c:rt6_lookup
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_ins_rt
Cyclomatic Complexity 9 net/ipv6/route.c:__ip6_rt_update_pmtu
Cyclomatic Complexity 2 net/ipv6/route.c:ip6_rt_update_pmtu
Cyclomatic Complexity 13 net/ipv6/route.c:ip6_pol_route
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_pol_route_input
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_pol_route_output
Cyclomatic Complexity 4 net/ipv6/route.c:ip6_nh_lookup_table
Cyclomatic Complexity 59 net/ipv6/route.c:ip6_route_info_create
Cyclomatic Complexity 3 net/ipv6/route.c:ip6_route_input_lookup
Cyclomatic Complexity 3 net/ipv6/route.c:ip6_route_input
Cyclomatic Complexity 10 net/ipv6/route.c:ip6_route_output_flags
Cyclomatic Complexity 1 include/net/ip6_route.h:ip6_route_output
Cyclomatic Complexity 18 net/ipv6/route.c:inet6_rtm_getroute
Cyclomatic Complexity 4 net/ipv6/route.c:ip6_blackhole_route
Cyclomatic Complexity 4 net/ipv6/route.c:ip6_update_pmtu
Cyclomatic Complexity 6 net/ipv6/route.c:ip6_sk_update_pmtu
Cyclomatic Complexity 3 net/ipv6/route.c:icmp6_dst_alloc
Cyclomatic Complexity 3 net/ipv6/route.c:icmp6_dst_gc
Cyclomatic Complexity 4 net/ipv6/route.c:ip6_route_add
Cyclomatic Complexity 3 net/ipv6/route.c:rt6_add_route_info
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_del_rt
Cyclomatic Complexity 30 net/ipv6/route.c:rt6_do_redirect
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_redirect
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_sk_redirect
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_redirect_no_header
Cyclomatic Complexity 5 net/ipv6/route.c:__rt6_purge_dflt_routers
Cyclomatic Complexity 5 net/ipv6/route.c:ip6_link_failure
Cyclomatic Complexity 4 net/ipv6/route.c:ip6_negative_advice
Cyclomatic Complexity 8 net/ipv6/route.c:rt6_get_dflt_router
Cyclomatic Complexity 16 net/ipv6/route.c:rt6_route_rcv
Cyclomatic Complexity 4 net/ipv6/route.c:rt6_add_dflt_router
Cyclomatic Complexity 6 net/ipv6/route.c:rt6_purge_dflt_routers
Cyclomatic Complexity 6 net/ipv6/route.c:ipv6_route_ioctl
Cyclomatic Complexity 6 net/ipv6/route.c:addrconf_dst_alloc
Cyclomatic Complexity 1 net/ipv6/route.c:rt6_remove_prefsrc
Cyclomatic Complexity 1 net/ipv6/route.c:rt6_clean_tohost
Cyclomatic Complexity 2 net/ipv6/route.c:rt6_ifdown
Cyclomatic Complexity 1 net/ipv6/route.c:rt6_mtu_change
Cyclomatic Complexity 5 net/ipv6/route.c:rt6_dump_route
Cyclomatic Complexity 6 net/ipv6/route.c:inet6_rt_notify
Cyclomatic Complexity 5 net/ipv6/route.c:ip6_route_mpath_notify
Cyclomatic Complexity 22 net/ipv6/route.c:ip6_route_multipath_add
Cyclomatic Complexity 3 net/ipv6/route.c:inet6_rtm_newroute
Cyclomatic Complexity 3 net/ipv6/route.c:ipv6_route_sysctl_init
Cyclomatic Complexity 14 net/ipv6/route.c:ip6_route_init
Cyclomatic Complexity 1 net/ipv6/route.c:ip6_route_cleanup
net/ipv6/route.c: In function 'ip6_route_del':
>> net/ipv6/route.c:2175:6: warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized]
int err;
^~~
vim +/err +2175 net/ipv6/route.c
^1da177e4 Linus Torvalds 2005-04-16 2159 }
^1da177e4 Linus Torvalds 2005-04-16 2160
e0a1ad73d Thomas Graf 2006-08-22 2161 int ip6_del_rt(struct rt6_info *rt)
e0a1ad73d Thomas Graf 2006-08-22 2162 {
4d1169c1e Denis V. Lunev 2008-01-10 2163 struct nl_info info = {
d19185428 David S. Miller 2011-12-28 2164 .nl_net = dev_net(rt->dst.dev),
4d1169c1e Denis V. Lunev 2008-01-10 2165 };
528c4ceb4 Denis V. Lunev 2007-12-13 2166 return __ip6_del_rt(rt, &info);
e0a1ad73d Thomas Graf 2006-08-22 2167 }
e0a1ad73d Thomas Graf 2006-08-22 2168
0ae813358 David Ahern 2017-02-02 2169 static int __ip6_del_rt_siblings(struct rt6_info *rt, struct fib6_config *cfg)
0ae813358 David Ahern 2017-02-02 2170 {
0ae813358 David Ahern 2017-02-02 2171 struct nl_info *info = &cfg->fc_nlinfo;
f0c30f4c1 Cong Wang 2017-02-27 2172 struct net *net = info->nl_net;
16a16cd35 David Ahern 2017-02-02 2173 struct sk_buff *skb = NULL;
0ae813358 David Ahern 2017-02-02 2174 struct fib6_table *table;
0ae813358 David Ahern 2017-02-02 @2175 int err;
0ae813358 David Ahern 2017-02-02 2176
f0c30f4c1 Cong Wang 2017-02-27 2177 if (rt == net->ipv6.ip6_null_entry)
f0c30f4c1 Cong Wang 2017-02-27 2178 goto out_put;
0ae813358 David Ahern 2017-02-02 2179 table = rt->rt6i_table;
0ae813358 David Ahern 2017-02-02 2180 write_lock_bh(&table->tb6_lock);
0ae813358 David Ahern 2017-02-02 2181
0ae813358 David Ahern 2017-02-02 2182 if (rt->rt6i_nsiblings && cfg->fc_delete_all_nh) {
0ae813358 David Ahern 2017-02-02 2183 struct rt6_info *sibling, *next_sibling;
:::::: The code at line 2175 was first introduced by commit
:::::: 0ae8133586ad1c9be894411aaf8b17bb58c8efe5 net: ipv6: Allow shorthand delete of all nexthops in multipath route
:::::: TO: David Ahern <dsa@...ulusnetworks.com>
:::::: CC: David S. Miller <davem@...emloft.net>
---
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