[bpf-next:master 801/821] kernel/bpf/bpf_iter.c:148:15-20: ERROR: invalid reference to the index variable of the iterator on line 133

[bpf-next:master 801/821] kernel/bpf/bpf_iter.c:148:15-20: ERROR: invalid reference to the index variable of the iterator on line 133

[kbuild test robot]

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CC: kbuild-all(a)lists.01.org
TO: Yonghong Song <yhs@fb.com>
CC: Alexei Starovoitov <ast@kernel.org>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
head:   b4563facdcae55c83039d5efcc3b45a63da14d2f
commit: de4e05cac46d206f9090051ef09930514bff73e4 [801/821] bpf: Support bpf tracing/iter programs for BPF_LINK_CREATE
:::::: branch date: 3 hours ago
:::::: commit date: 4 hours ago

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: Julia Lawall <julia.lawall@lip6.fr>


coccinelle warnings: (new ones prefixed by >>)

>> kernel/bpf/bpf_iter.c:148:15-20: ERROR: invalid reference to the index variable of the iterator on line 133

# https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=de4e05cac46d206f9090051ef09930514bff73e4
git remote add bpf-next https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git
git remote update bpf-next
git checkout de4e05cac46d206f9090051ef09930514bff73e4
vim +148 kernel/bpf/bpf_iter.c

de4e05cac46d20 Yonghong Song 2020-05-09  118  
de4e05cac46d20 Yonghong Song 2020-05-09  119  int bpf_iter_link_attach(const union bpf_attr *attr, struct bpf_prog *prog)
de4e05cac46d20 Yonghong Song 2020-05-09  120  {
de4e05cac46d20 Yonghong Song 2020-05-09  121  	struct bpf_link_primer link_primer;
de4e05cac46d20 Yonghong Song 2020-05-09  122  	struct bpf_iter_target_info *tinfo;
de4e05cac46d20 Yonghong Song 2020-05-09  123  	struct bpf_iter_link *link;
de4e05cac46d20 Yonghong Song 2020-05-09  124  	bool existed = false;
de4e05cac46d20 Yonghong Song 2020-05-09  125  	u32 prog_btf_id;
de4e05cac46d20 Yonghong Song 2020-05-09  126  	int err;
de4e05cac46d20 Yonghong Song 2020-05-09  127  
de4e05cac46d20 Yonghong Song 2020-05-09  128  	if (attr->link_create.target_fd || attr->link_create.flags)
de4e05cac46d20 Yonghong Song 2020-05-09  129  		return -EINVAL;
de4e05cac46d20 Yonghong Song 2020-05-09  130  
de4e05cac46d20 Yonghong Song 2020-05-09  131  	prog_btf_id = prog->aux->attach_btf_id;
de4e05cac46d20 Yonghong Song 2020-05-09  132  	mutex_lock(&targets_mutex);
de4e05cac46d20 Yonghong Song 2020-05-09 @133  	list_for_each_entry(tinfo, &targets, list) {
de4e05cac46d20 Yonghong Song 2020-05-09  134  		if (tinfo->btf_id == prog_btf_id) {
de4e05cac46d20 Yonghong Song 2020-05-09  135  			existed = true;
de4e05cac46d20 Yonghong Song 2020-05-09  136  			break;
de4e05cac46d20 Yonghong Song 2020-05-09  137  		}
de4e05cac46d20 Yonghong Song 2020-05-09  138  	}
de4e05cac46d20 Yonghong Song 2020-05-09  139  	mutex_unlock(&targets_mutex);
de4e05cac46d20 Yonghong Song 2020-05-09  140  	if (!existed)
de4e05cac46d20 Yonghong Song 2020-05-09  141  		return -ENOENT;
de4e05cac46d20 Yonghong Song 2020-05-09  142  
de4e05cac46d20 Yonghong Song 2020-05-09  143  	link = kzalloc(sizeof(*link), GFP_USER | __GFP_NOWARN);
de4e05cac46d20 Yonghong Song 2020-05-09  144  	if (!link)
de4e05cac46d20 Yonghong Song 2020-05-09  145  		return -ENOMEM;
de4e05cac46d20 Yonghong Song 2020-05-09  146  
de4e05cac46d20 Yonghong Song 2020-05-09  147  	bpf_link_init(&link->link, BPF_LINK_TYPE_ITER, &bpf_iter_link_lops, prog);
de4e05cac46d20 Yonghong Song 2020-05-09 @148  	link->tinfo = tinfo;

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