linux-kernel - Re: [PATCH net-next 6/8] net:openvswitch: add psample support

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Message-ID: <29e82a41-5e10-4135-9928-468e5d3abf39@moroto.mountain>
Date: Tue, 30 Apr 2024 10:29:56 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: oe-kbuild@...ts.linux.dev, Adrian Moreno <amorenoz@...hat.com>,
	netdev@...r.kernel.org
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev, aconole@...hat.com,
	echaudro@...hat.com, horms@...nel.org, i.maximets@....org,
	Adrian Moreno <amorenoz@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Pravin B Shelar <pshelar@....org>,
	Donald Hunter <donald.hunter@...il.com>,
	linux-kernel@...r.kernel.org, dev@...nvswitch.org
Subject: Re: [PATCH net-next 6/8] net:openvswitch: add psample support

Hi Adrian,

kernel test robot noticed the following build warnings:

url:    https://github.com/intel-lab-lkp/linux/commits/Adrian-Moreno/net-netlink-export-genl-private-pointer-getters/20240424-215821
base:   net-next/main
patch link:    https://lore.kernel.org/r/20240424135109.3524355-7-amorenoz%40redhat.com
patch subject: [PATCH net-next 6/8] net:openvswitch: add psample support
config: i386-randconfig-141-20240430 (https://download.01.org/0day-ci/archive/20240430/202404300611.kJOZL2KI-lkp@intel.com/config)
compiler: gcc-13 (Ubuntu 13.2.0-4ubuntu3) 13.2.0

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@...el.com>
| Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
| Closes: https://lore.kernel.org/r/202404300611.kJOZL2KI-lkp@intel.com/

New smatch warnings:
net/openvswitch/actions.c:1097 sample() error: uninitialized symbol 'ret'.

vim +/ret +1097 net/openvswitch/actions.c

ccb1352e76cff0 Jesse Gross        2011-10-25  1061  static int sample(struct datapath *dp, struct sk_buff *skb,
ccea74457bbdaf Neil McKee         2015-05-26  1062  		  struct sw_flow_key *key, const struct nlattr *attr,
798c166173ffb5 andy zhou          2017-03-20  1063  		  bool last)
ccb1352e76cff0 Jesse Gross        2011-10-25  1064  {
ccc0b9e4657efd Adrian Moreno      2024-04-24  1065  	const struct sample_arg *arg;
798c166173ffb5 andy zhou          2017-03-20  1066  	struct nlattr *sample_arg;
798c166173ffb5 andy zhou          2017-03-20  1067  	int rem = nla_len(attr);
ccc0b9e4657efd Adrian Moreno      2024-04-24  1068  	struct nlattr *actions;
bef7f7567a104a andy zhou          2017-03-20  1069  	bool clone_flow_key;
ccc0b9e4657efd Adrian Moreno      2024-04-24  1070  	int ret;
ccb1352e76cff0 Jesse Gross        2011-10-25  1071  
798c166173ffb5 andy zhou          2017-03-20  1072  	/* The first action is always 'OVS_SAMPLE_ATTR_ARG'. */
798c166173ffb5 andy zhou          2017-03-20  1073  	sample_arg = nla_data(attr);
798c166173ffb5 andy zhou          2017-03-20  1074  	arg = nla_data(sample_arg);
798c166173ffb5 andy zhou          2017-03-20  1075  	actions = nla_next(sample_arg, &rem);
e05176a3283822 Wenyu Zhang        2015-08-05  1076  
798c166173ffb5 andy zhou          2017-03-20  1077  	if ((arg->probability != U32_MAX) &&
a251c17aa558d8 Jason A. Donenfeld 2022-10-05  1078  	    (!arg->probability || get_random_u32() > arg->probability)) {
798c166173ffb5 andy zhou          2017-03-20  1079  		if (last)
9d802da40b7c82 Adrian Moreno      2023-08-11  1080  			ovs_kfree_skb_reason(skb, OVS_DROP_LAST_ACTION);
ccb1352e76cff0 Jesse Gross        2011-10-25  1081  		return 0;
ccb1352e76cff0 Jesse Gross        2011-10-25  1082  	}
651887b0c22cff Simon Horman       2014-07-21  1083  
ccc0b9e4657efd Adrian Moreno      2024-04-24  1084  	if (arg->flags & OVS_SAMPLE_ARG_FLAG_PSAMPLE) {
ccc0b9e4657efd Adrian Moreno      2024-04-24  1085  		ret = ovs_psample_packet(dp, key, arg, skb);
ccc0b9e4657efd Adrian Moreno      2024-04-24  1086  		if (ret)
ccc0b9e4657efd Adrian Moreno      2024-04-24  1087  			return ret;
ccc0b9e4657efd Adrian Moreno      2024-04-24  1088  	}
ccc0b9e4657efd Adrian Moreno      2024-04-24  1089  
ccc0b9e4657efd Adrian Moreno      2024-04-24  1090  	if (nla_ok(actions, rem)) {
ccc0b9e4657efd Adrian Moreno      2024-04-24  1091  		clone_flow_key = !(arg->flags & OVS_SAMPLE_ARG_FLAG_EXEC);
ccc0b9e4657efd Adrian Moreno      2024-04-24  1092  		ret = clone_execute(dp, skb, key, 0, actions, rem, last,
bef7f7567a104a andy zhou          2017-03-20  1093  				    clone_flow_key);
ccc0b9e4657efd Adrian Moreno      2024-04-24  1094  	} else if (last) {
ccc0b9e4657efd Adrian Moreno      2024-04-24  1095  		ovs_kfree_skb_reason(skb, OVS_DROP_LAST_ACTION);

ret is uninitialized on this last path.

ccc0b9e4657efd Adrian Moreno      2024-04-24  1096  	}
ccc0b9e4657efd Adrian Moreno      2024-04-24 @1097  	return ret;
971427f353f3c4 Andy Zhou          2014-09-15  1098  }

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