linux-kernel - net/ipv6/seg6.c:430:24: sparse: sparse: incorrect type in assignment (different address spaces)

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Message-ID: <202512110721.RFqufwXf-lkp@intel.com>
Date: Thu, 11 Dec 2025 07:38:14 +0800
From: kernel test robot <lkp@...el.com>
To: Suren Baghdasaryan <surenb@...gle.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>
Subject: net/ipv6/seg6.c:430:24: sparse: sparse: incorrect type in assignment
 (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   0048fbb4011ec55c32d3148b2cda56433f273375
commit: 07438779313caafe52ac1a1a6958d735a5938988 alloc_tag: avoid current->alloc_tag manipulations when profiling is disabled
date:   11 months ago
config: i386-randconfig-063-20251211 (https://download.01.org/0day-ci/archive/20251211/202512110721.RFqufwXf-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251211/202512110721.RFqufwXf-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/202512110721.RFqufwXf-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   net/ipv6/seg6.c:252:15: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct in6_addr *t_old @@     got struct in6_addr [noderef] __rcu *tun_src @@
   net/ipv6/seg6.c:252:15: sparse:     expected struct in6_addr *t_old
   net/ipv6/seg6.c:252:15: sparse:     got struct in6_addr [noderef] __rcu *tun_src
>> net/ipv6/seg6.c:430:24: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected struct in6_addr [noderef] __rcu *tun_src @@     got void *[assigned] _res @@
   net/ipv6/seg6.c:430:24: sparse:     expected struct in6_addr [noderef] __rcu *tun_src
   net/ipv6/seg6.c:430:24: sparse:     got void *[assigned] _res

vim +430 net/ipv6/seg6.c

4f4853dc1c9c19 David Lebrun 2016-11-08  419  
915d7e5e5930b4 David Lebrun 2016-11-08  420  static int __net_init seg6_net_init(struct net *net)
915d7e5e5930b4 David Lebrun 2016-11-08  421  {
915d7e5e5930b4 David Lebrun 2016-11-08  422  	struct seg6_pernet_data *sdata;
915d7e5e5930b4 David Lebrun 2016-11-08  423  
915d7e5e5930b4 David Lebrun 2016-11-08  424  	sdata = kzalloc(sizeof(*sdata), GFP_KERNEL);
915d7e5e5930b4 David Lebrun 2016-11-08  425  	if (!sdata)
915d7e5e5930b4 David Lebrun 2016-11-08  426  		return -ENOMEM;
915d7e5e5930b4 David Lebrun 2016-11-08  427  
915d7e5e5930b4 David Lebrun 2016-11-08  428  	mutex_init(&sdata->lock);
915d7e5e5930b4 David Lebrun 2016-11-08  429  
915d7e5e5930b4 David Lebrun 2016-11-08 @430  	sdata->tun_src = kzalloc(sizeof(*sdata->tun_src), GFP_KERNEL);
915d7e5e5930b4 David Lebrun 2016-11-08  431  	if (!sdata->tun_src) {
915d7e5e5930b4 David Lebrun 2016-11-08  432  		kfree(sdata);
915d7e5e5930b4 David Lebrun 2016-11-08  433  		return -ENOMEM;
915d7e5e5930b4 David Lebrun 2016-11-08  434  	}
915d7e5e5930b4 David Lebrun 2016-11-08  435  
915d7e5e5930b4 David Lebrun 2016-11-08  436  	net->ipv6.seg6_data = sdata;
915d7e5e5930b4 David Lebrun 2016-11-08  437  
f04ed7d277e842 MichelleJin  2021-09-27  438  	if (seg6_hmac_net_init(net)) {
f04ed7d277e842 MichelleJin  2021-09-27  439  		kfree(rcu_dereference_raw(sdata->tun_src));
23b08260481ca5 MichelleJin  2021-10-02  440  		kfree(sdata);
f04ed7d277e842 MichelleJin  2021-09-27  441  		return -ENOMEM;
acaea0d5a63406 Zhang Mingyu 2021-11-03  442  	}
4f4853dc1c9c19 David Lebrun 2016-11-08  443  
915d7e5e5930b4 David Lebrun 2016-11-08  444  	return 0;
915d7e5e5930b4 David Lebrun 2016-11-08  445  }
915d7e5e5930b4 David Lebrun 2016-11-08  446  

:::::: The code at line 430 was first introduced by commit
:::::: 915d7e5e5930b4f01d0971d93b9b25ed17d221aa ipv6: sr: add code base for control plane support of SR-IPv6

:::::: TO: David Lebrun <david.lebrun@...ouvain.be>
:::::: CC: David S. Miller <davem@...emloft.net>

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki