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Date: Fri, 23 Feb 2024 14:21:30 +0300
From: Dan Carpenter <dan.carpenter@linaro.org>
To: oe-kbuild@lists.linux.dev, Joe Damato <jdamato@fastly.com>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: lkp@intel.com, oe-kbuild-all@lists.linux.dev,
	Joe Damato <jdamato@fastly.com>, Eric Dumazet <edumazet@google.com>,
	Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
	Jesper Dangaard Brouer <hawk@kernel.org>,
	Stanislav Fomichev <sdf@google.com>,
	Amritha Nambiar <amritha.nambiar@intel.com>,
	Larysa Zaremba <larysa.zaremba@intel.com>,
	Lorenzo Bianconi <lorenzo@kernel.org>,
	Tariq Toukan <tariqt@nvidia.com>,
	Sridhar Samudrala <sridhar.samudrala@intel.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Subject: Re: [PATCH net-next 1/2] netdev-genl: Add ifname for queue and NAPI
 APIs
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In-Reply-To: <1708531057-67392-2-git-send-email-jdamato@fastly.com>

Hi Joe,

kernel test robot noticed the following build warnings:

url:    https://github.com/intel-lab-lkp/linux/commits/Joe-Damato/netdev-genl-Add-ifname-for-queue-and-NAPI-APIs/20240222-000134
base:   net-next/main
patch link:    https://lore.kernel.org/r/1708531057-67392-2-git-send-email-jdamato%40fastly.com
patch subject: [PATCH net-next 1/2] netdev-genl: Add ifname for queue and NAPI APIs
config: i386-randconfig-141-20240222 (https://download.01.org/0day-ci/archive/20240223/202402231851.2NeORqwi-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0

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@intel.com>
| Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
| Closes: https://lore.kernel.org/r/202402231851.2NeORqwi-lkp@intel.com/

New smatch warnings:
net/core/netdev-genl.c:388 netdev_nl_queue_get_doit() error: uninitialized symbol 'ifname'.

vim +/ifname +388 net/core/netdev-genl.c

bc877956272f05 Amritha Nambiar 2023-12-01  371  int netdev_nl_queue_get_doit(struct sk_buff *skb, struct genl_info *info)
bc877956272f05 Amritha Nambiar 2023-12-01  372  {
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  373  	u32 q_id, q_type, ifindex;
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  374  	struct net_device *netdev;
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  375  	struct sk_buff *rsp;
f340b224321fa6 Joe Damato      2024-02-21  376  	char *ifname;
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  377  	int err;
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  378  
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  379  	if (GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_ID) ||
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  380  	    GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_TYPE) ||
f340b224321fa6 Joe Damato      2024-02-21  381  	    GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_IFINDEX) ||
f340b224321fa6 Joe Damato      2024-02-21  382  	    GENL_REQ_ATTR_CHECK(info, NETDEV_A_QUEUE_IFNAME))
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  383  		return -EINVAL;
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  384  
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  385  	q_id = nla_get_u32(info->attrs[NETDEV_A_QUEUE_ID]);
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  386  	q_type = nla_get_u32(info->attrs[NETDEV_A_QUEUE_TYPE]);
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  387  	ifindex = nla_get_u32(info->attrs[NETDEV_A_QUEUE_IFINDEX]);
f340b224321fa6 Joe Damato      2024-02-21 @388  	nla_strscpy(ifname, info->attrs[NETDEV_A_QUEUE_IFNAME], IFNAMSIZ);
                                                                    ^^^^^^
missing initialization

6b6171db7fc8f7 Amritha Nambiar 2023-12-01  389  
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  390  	rsp = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  391  	if (!rsp)
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  392  		return -ENOMEM;
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  393  
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  394  	rtnl_lock();
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  395  
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  396  	netdev = __dev_get_by_index(genl_info_net(info), ifindex);
f340b224321fa6 Joe Damato      2024-02-21  397  
f340b224321fa6 Joe Damato      2024-02-21  398  	if (strcmp(netdev->name, ifname)) {
f340b224321fa6 Joe Damato      2024-02-21  399  		err = -ENODEV;
f340b224321fa6 Joe Damato      2024-02-21  400  	} else {
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  401  		if (netdev)
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  402  			err = netdev_nl_queue_fill(rsp, netdev, q_id, q_type, info);
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  403  		else
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  404  			err = -ENODEV;
f340b224321fa6 Joe Damato      2024-02-21  405  	}
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  406  
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  407  	rtnl_unlock();
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  408  
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  409  	if (err)
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  410  		goto err_free_msg;
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  411  
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  412  	return genlmsg_reply(rsp, info);
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  413  
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  414  err_free_msg:
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  415  	nlmsg_free(rsp);
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  416  	return err;
6b6171db7fc8f7 Amritha Nambiar 2023-12-01  417  }

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