linux-kernel - net/sched/act_bpf.c:132:35: sparse: sparse: incorrect type in argument 2 (different address spaces)

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Date:   Thu, 2 Jul 2020 18:16:31 +0800
From:   kernel test robot <lkp@...el.com>
To:     Luc Van Oostenryck <luc.vanoostenryck@...il.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: net/sched/act_bpf.c:132:35: sparse: sparse: incorrect type in
 argument 2 (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   cd77006e01b3198c75fb7819b3d0ff89709539bb
commit: 670d0a4b10704667765f7d18f7592993d02783aa sparse: use identifiers to define address spaces
date:   2 weeks ago
config: x86_64-randconfig-s021-20200702 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-14) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.2-3-gfa153962-dirty
        git checkout 670d0a4b10704667765f7d18f7592993d02783aa
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)

>> net/sched/act_bpf.c:132:35: sparse: sparse: incorrect type in argument 2 (different address spaces) @@     expected void const *from @@     got unsigned char [noderef] __rcu * @@
   net/sched/act_bpf.c:132:35: sparse:     expected void const *from
   net/sched/act_bpf.c:132:35: sparse:     got unsigned char [noderef] __rcu *
   net/sched/act_bpf.c:125:50: sparse: sparse: dereference of noderef expression
   net/sched/act_bpf.c:125:50: sparse: sparse: dereference of noderef expression

vim +132 net/sched/act_bpf.c

a8cb5f556b5679 Daniel Borkmann 2015-03-20  115  
a8cb5f556b5679 Daniel Borkmann 2015-03-20  116  static int tcf_bpf_dump_ebpf_info(const struct tcf_bpf *prog,
a8cb5f556b5679 Daniel Borkmann 2015-03-20  117  				  struct sk_buff *skb)
a8cb5f556b5679 Daniel Borkmann 2015-03-20  118  {
7bd509e311f408 Daniel Borkmann 2016-12-04  119  	struct nlattr *nla;
7bd509e311f408 Daniel Borkmann 2016-12-04  120  
a8cb5f556b5679 Daniel Borkmann 2015-03-20  121  	if (prog->bpf_name &&
a8cb5f556b5679 Daniel Borkmann 2015-03-20  122  	    nla_put_string(skb, TCA_ACT_BPF_NAME, prog->bpf_name))
a8cb5f556b5679 Daniel Borkmann 2015-03-20  123  		return -EMSGSIZE;
a8cb5f556b5679 Daniel Borkmann 2015-03-20  124  
e86283071fb0ee Daniel Borkmann 2017-06-21  125  	if (nla_put_u32(skb, TCA_ACT_BPF_ID, prog->filter->aux->id))
e86283071fb0ee Daniel Borkmann 2017-06-21  126  		return -EMSGSIZE;
e86283071fb0ee Daniel Borkmann 2017-06-21  127  
f1f7714ea51c56 Daniel Borkmann 2017-01-13  128  	nla = nla_reserve(skb, TCA_ACT_BPF_TAG, sizeof(prog->filter->tag));
7bd509e311f408 Daniel Borkmann 2016-12-04  129  	if (nla == NULL)
7bd509e311f408 Daniel Borkmann 2016-12-04  130  		return -EMSGSIZE;
7bd509e311f408 Daniel Borkmann 2016-12-04  131  
f1f7714ea51c56 Daniel Borkmann 2017-01-13 @132  	memcpy(nla_data(nla), prog->filter->tag, nla_len(nla));
7bd509e311f408 Daniel Borkmann 2016-12-04  133  
a8cb5f556b5679 Daniel Borkmann 2015-03-20  134  	return 0;
a8cb5f556b5679 Daniel Borkmann 2015-03-20  135  }
a8cb5f556b5679 Daniel Borkmann 2015-03-20  136  

:::::: The code at line 132 was first introduced by commit
:::::: f1f7714ea51c56b7163fb1a5acf39c6a204dd758 bpf: rework prog_digest into prog_tag

:::::: TO: Daniel Borkmann <daniel@...earbox.net>
:::::: CC: David S. Miller <davem@...emloft.net>

---
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https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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