[linux-next:master 3894/5318] net/mctp/device.c:133 mctp_dump_addrinfo() error: uninitialized symbol 'idx'.

[linux-next:master 3894/5318] net/mctp/device.c:133 mctp_dump_addrinfo() error: uninitialized symbol 'idx'.

[kernel test robot]

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CC: kbuild-all(a)lists.01.org
CC: Linux Memory Management List <linux-mm@kvack.org>
TO: Jeremy Kerr <jk@codeconstruct.com.au>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   2f73937c9aa561e2082839bc1a8efaac75d6e244
commit: 583be982d93479ea3d85091b0fd0b01201ede87d [3894/5318] mctp: Add device handling and netlink interface
:::::: branch date: 14 hours ago
:::::: commit date: 7 days ago
config: nios2-randconfig-m031-20210804 (attached as .config)
compiler: nios2-linux-gcc (GCC) 10.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

New smatch warnings:
net/mctp/device.c:133 mctp_dump_addrinfo() error: uninitialized symbol 'idx'.

Old smatch warnings:
arch/nios2/include/asm/thread_info.h:71 current_thread_info() error: uninitialized symbol 'sp'.

vim +/idx +133 net/mctp/device.c

583be982d93479 Jeremy Kerr 2021-07-29   93  
583be982d93479 Jeremy Kerr 2021-07-29   94  static int mctp_dump_addrinfo(struct sk_buff *skb, struct netlink_callback *cb)
583be982d93479 Jeremy Kerr 2021-07-29   95  {
583be982d93479 Jeremy Kerr 2021-07-29   96  	struct mctp_dump_cb *mcb = (void *)cb->ctx;
583be982d93479 Jeremy Kerr 2021-07-29   97  	struct net *net = sock_net(skb->sk);
583be982d93479 Jeremy Kerr 2021-07-29   98  	struct hlist_head *head;
583be982d93479 Jeremy Kerr 2021-07-29   99  	struct net_device *dev;
583be982d93479 Jeremy Kerr 2021-07-29  100  	struct ifaddrmsg *hdr;
583be982d93479 Jeremy Kerr 2021-07-29  101  	struct mctp_dev *mdev;
583be982d93479 Jeremy Kerr 2021-07-29  102  	int ifindex;
583be982d93479 Jeremy Kerr 2021-07-29  103  	int idx, rc;
583be982d93479 Jeremy Kerr 2021-07-29  104  
583be982d93479 Jeremy Kerr 2021-07-29  105  	hdr = nlmsg_data(cb->nlh);
583be982d93479 Jeremy Kerr 2021-07-29  106  	// filter by ifindex if requested
583be982d93479 Jeremy Kerr 2021-07-29  107  	ifindex = hdr->ifa_index;
583be982d93479 Jeremy Kerr 2021-07-29  108  
583be982d93479 Jeremy Kerr 2021-07-29  109  	rcu_read_lock();
583be982d93479 Jeremy Kerr 2021-07-29  110  	for (; mcb->h < NETDEV_HASHENTRIES; mcb->h++, mcb->idx = 0) {
583be982d93479 Jeremy Kerr 2021-07-29  111  		idx = 0;
583be982d93479 Jeremy Kerr 2021-07-29  112  		head = &net->dev_index_head[mcb->h];
583be982d93479 Jeremy Kerr 2021-07-29  113  		hlist_for_each_entry_rcu(dev, head, index_hlist) {
583be982d93479 Jeremy Kerr 2021-07-29  114  			if (idx >= mcb->idx &&
583be982d93479 Jeremy Kerr 2021-07-29  115  			    (ifindex == 0 || ifindex == dev->ifindex)) {
583be982d93479 Jeremy Kerr 2021-07-29  116  				mdev = __mctp_dev_get(dev);
583be982d93479 Jeremy Kerr 2021-07-29  117  				if (mdev) {
583be982d93479 Jeremy Kerr 2021-07-29  118  					rc = mctp_dump_dev_addrinfo(mdev,
583be982d93479 Jeremy Kerr 2021-07-29  119  								    skb, cb);
583be982d93479 Jeremy Kerr 2021-07-29  120  					// Error indicates full buffer, this
583be982d93479 Jeremy Kerr 2021-07-29  121  					// callback will get retried.
583be982d93479 Jeremy Kerr 2021-07-29  122  					if (rc < 0)
583be982d93479 Jeremy Kerr 2021-07-29  123  						goto out;
583be982d93479 Jeremy Kerr 2021-07-29  124  				}
583be982d93479 Jeremy Kerr 2021-07-29  125  			}
583be982d93479 Jeremy Kerr 2021-07-29  126  			idx++;
583be982d93479 Jeremy Kerr 2021-07-29  127  			// reset for next iteration
583be982d93479 Jeremy Kerr 2021-07-29  128  			mcb->a_idx = 0;
583be982d93479 Jeremy Kerr 2021-07-29  129  		}
583be982d93479 Jeremy Kerr 2021-07-29  130  	}
583be982d93479 Jeremy Kerr 2021-07-29  131  out:
583be982d93479 Jeremy Kerr 2021-07-29  132  	rcu_read_unlock();
583be982d93479 Jeremy Kerr 2021-07-29 @133  	mcb->idx = idx;
583be982d93479 Jeremy Kerr 2021-07-29  134  
583be982d93479 Jeremy Kerr 2021-07-29  135  	return skb->len;
583be982d93479 Jeremy Kerr 2021-07-29  136  }
583be982d93479 Jeremy Kerr 2021-07-29  137  

---
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