Re: [PATCH v2 2/2] hwmon: Add "label" attribute

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Hi Paul,

url:    https://github.com/0day-ci/linux/commits/Paul-Cercueil/hwmon-Add-label-attribute-v2/20220105-231930
base:   https://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging.git hwmon-next
config: i386-randconfig-m021-20220105 (https://download.01.org/0day-ci/archive/20220108/202201081730.TlHZabuC-lkp@xxxxxxxxx/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0

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

smatch warnings:
drivers/hwmon/hwmon.c:851 __hwmon_device_register() error: uninitialized symbol 'hdev'.
drivers/hwmon/hwmon.c:854 __hwmon_device_register() warn: possible memory leak of 'hwdev'

vim +/hdev +851 drivers/hwmon/hwmon.c

d560168b5d0fb4 Guenter Roeck    2015-08-26  745  static struct device *
d560168b5d0fb4 Guenter Roeck    2015-08-26  746  __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
d560168b5d0fb4 Guenter Roeck    2015-08-26  747  			const struct hwmon_chip_info *chip,
bab2243ce18978 Guenter Roeck    2013-07-06  748  			const struct attribute_group **groups)
1236441f38b6a9 Mark M. Hoffman  2005-07-15  749  {
bab2243ce18978 Guenter Roeck    2013-07-06  750  	struct hwmon_device *hwdev;
57dab49995d01d Paul Cercueil    2022-01-05  751  	const char *label;
d560168b5d0fb4 Guenter Roeck    2015-08-26  752  	struct device *hdev;
44e3ad882bb268 Akinobu Mita     2020-05-04  753  	int i, err, id;
ded2b666156130 Mark M. Hoffman  2006-03-05  754  
74d3b6419772e4 Guenter Roeck    2017-01-27  755  	/* Complain about invalid characters in hwmon name attribute */
648cd48c9e566f Guenter Roeck    2014-02-28  756  	if (name && (!strlen(name) || strpbrk(name, "-* \t\n")))
74d3b6419772e4 Guenter Roeck    2017-01-27  757  		dev_warn(dev,
74d3b6419772e4 Guenter Roeck    2017-01-27  758  			 "hwmon: '%s' is not a valid name attribute, please fix\n",
74d3b6419772e4 Guenter Roeck    2017-01-27  759  			 name);
648cd48c9e566f Guenter Roeck    2014-02-28  760  
4ca5f468cc2a0b Jonathan Cameron 2011-10-31  761  	id = ida_simple_get(&hwmon_ida, 0, 0, GFP_KERNEL);
4ca5f468cc2a0b Jonathan Cameron 2011-10-31  762  	if (id < 0)
4ca5f468cc2a0b Jonathan Cameron 2011-10-31  763  		return ERR_PTR(id);
1236441f38b6a9 Mark M. Hoffman  2005-07-15  764  
bab2243ce18978 Guenter Roeck    2013-07-06  765  	hwdev = kzalloc(sizeof(*hwdev), GFP_KERNEL);
bab2243ce18978 Guenter Roeck    2013-07-06  766  	if (hwdev == NULL) {
bab2243ce18978 Guenter Roeck    2013-07-06  767  		err = -ENOMEM;
bab2243ce18978 Guenter Roeck    2013-07-06  768  		goto ida_remove;
bab2243ce18978 Guenter Roeck    2013-07-06  769  	}
1236441f38b6a9 Mark M. Hoffman  2005-07-15  770  
57dab49995d01d Paul Cercueil    2022-01-05  771  	if (device_property_present(dev, "label")) {
57dab49995d01d Paul Cercueil    2022-01-05  772  		err = device_property_read_string(dev, "label", &label);
57dab49995d01d Paul Cercueil    2022-01-05  773  		if (err < 0)
57dab49995d01d Paul Cercueil    2022-01-05  774  			goto free_hwmon;

"hwdev" not freed on this goto path and "hdev" is uninitialized.  Sort
of related bugs.

57dab49995d01d Paul Cercueil    2022-01-05  775  
57dab49995d01d Paul Cercueil    2022-01-05  776  		hwdev->label = kstrdup(label, GFP_KERNEL);
57dab49995d01d Paul Cercueil    2022-01-05  777  		if (hwdev->label == NULL) {
57dab49995d01d Paul Cercueil    2022-01-05  778  			err = -ENOMEM;
57dab49995d01d Paul Cercueil    2022-01-05  779  			goto free_hwmon;
57dab49995d01d Paul Cercueil    2022-01-05  780  		}
57dab49995d01d Paul Cercueil    2022-01-05  781  	}
57dab49995d01d Paul Cercueil    2022-01-05  782  
d560168b5d0fb4 Guenter Roeck    2015-08-26  783  	hdev = &hwdev->dev;
d560168b5d0fb4 Guenter Roeck    2015-08-26  784  
239552f495b91f Guenter Roeck    2016-10-16  785  	if (chip) {
d560168b5d0fb4 Guenter Roeck    2015-08-26  786  		struct attribute **attrs;
b2a4cc3a060da0 Guenter Roeck    2016-10-16  787  		int ngroups = 2; /* terminating NULL plus &hwdev->groups */
d560168b5d0fb4 Guenter Roeck    2015-08-26  788  
d560168b5d0fb4 Guenter Roeck    2015-08-26  789  		if (groups)
d560168b5d0fb4 Guenter Roeck    2015-08-26  790  			for (i = 0; groups[i]; i++)
d560168b5d0fb4 Guenter Roeck    2015-08-26  791  				ngroups++;
d560168b5d0fb4 Guenter Roeck    2015-08-26  792  
3bf8bdcf3bada7 Guenter Roeck    2020-01-16  793  		hwdev->groups = kcalloc(ngroups, sizeof(*groups), GFP_KERNEL);
38d8ed65092ed2 Colin Ian King   2016-10-23  794  		if (!hwdev->groups) {
38d8ed65092ed2 Colin Ian King   2016-10-23  795  			err = -ENOMEM;
38d8ed65092ed2 Colin Ian King   2016-10-23  796  			goto free_hwmon;
38d8ed65092ed2 Colin Ian King   2016-10-23  797  		}
d560168b5d0fb4 Guenter Roeck    2015-08-26  798  
3bf8bdcf3bada7 Guenter Roeck    2020-01-16  799  		attrs = __hwmon_create_attrs(drvdata, chip);
d560168b5d0fb4 Guenter Roeck    2015-08-26  800  		if (IS_ERR(attrs)) {
d560168b5d0fb4 Guenter Roeck    2015-08-26  801  			err = PTR_ERR(attrs);
d560168b5d0fb4 Guenter Roeck    2015-08-26  802  			goto free_hwmon;
d560168b5d0fb4 Guenter Roeck    2015-08-26  803  		}
d560168b5d0fb4 Guenter Roeck    2015-08-26  804  
d560168b5d0fb4 Guenter Roeck    2015-08-26  805  		hwdev->group.attrs = attrs;
d560168b5d0fb4 Guenter Roeck    2015-08-26  806  		ngroups = 0;
d560168b5d0fb4 Guenter Roeck    2015-08-26  807  		hwdev->groups[ngroups++] = &hwdev->group;
d560168b5d0fb4 Guenter Roeck    2015-08-26  808  
d560168b5d0fb4 Guenter Roeck    2015-08-26  809  		if (groups) {
d560168b5d0fb4 Guenter Roeck    2015-08-26  810  			for (i = 0; groups[i]; i++)
d560168b5d0fb4 Guenter Roeck    2015-08-26  811  				hwdev->groups[ngroups++] = groups[i];
d560168b5d0fb4 Guenter Roeck    2015-08-26  812  		}
d560168b5d0fb4 Guenter Roeck    2015-08-26  813  
d560168b5d0fb4 Guenter Roeck    2015-08-26  814  		hdev->groups = hwdev->groups;
d560168b5d0fb4 Guenter Roeck    2015-08-26  815  	} else {
d560168b5d0fb4 Guenter Roeck    2015-08-26  816  		hdev->groups = groups;
d560168b5d0fb4 Guenter Roeck    2015-08-26  817  	}
d560168b5d0fb4 Guenter Roeck    2015-08-26  818  
bab2243ce18978 Guenter Roeck    2013-07-06  819  	hwdev->name = name;
d560168b5d0fb4 Guenter Roeck    2015-08-26  820  	hdev->class = &hwmon_class;
d560168b5d0fb4 Guenter Roeck    2015-08-26  821  	hdev->parent = dev;
d560168b5d0fb4 Guenter Roeck    2015-08-26  822  	hdev->of_node = dev ? dev->of_node : NULL;
d560168b5d0fb4 Guenter Roeck    2015-08-26  823  	hwdev->chip = chip;
d560168b5d0fb4 Guenter Roeck    2015-08-26  824  	dev_set_drvdata(hdev, drvdata);
d560168b5d0fb4 Guenter Roeck    2015-08-26  825  	dev_set_name(hdev, HWMON_ID_FORMAT, id);
d560168b5d0fb4 Guenter Roeck    2015-08-26  826  	err = device_register(hdev);
ada61aa0b1184a Yang Yingliang   2021-10-12  827  	if (err) {
ada61aa0b1184a Yang Yingliang   2021-10-12  828  		put_device(hdev);
ada61aa0b1184a Yang Yingliang   2021-10-12  829  		goto ida_remove;
ada61aa0b1184a Yang Yingliang   2021-10-12  830  	}
d560168b5d0fb4 Guenter Roeck    2015-08-26  831  
1597b374af2226 Guenter Roeck    2020-05-28  832  	INIT_LIST_HEAD(&hwdev->tzdata);
1597b374af2226 Guenter Roeck    2020-05-28  833  
c41dd48e21fae3 Eduardo Valentin 2019-05-29  834  	if (dev && dev->of_node && chip && chip->ops->read &&
d560168b5d0fb4 Guenter Roeck    2015-08-26  835  	    chip->info[0]->type == hwmon_chip &&
d560168b5d0fb4 Guenter Roeck    2015-08-26  836  	    (chip->info[0]->config[0] & HWMON_C_REGISTER_TZ)) {
44e3ad882bb268 Akinobu Mita     2020-05-04  837  		err = hwmon_thermal_register_sensors(hdev);
74e3512731bd5c Dmitry Osipenko  2018-10-24  838  		if (err) {
74e3512731bd5c Dmitry Osipenko  2018-10-24  839  			device_unregister(hdev);
792eac18431967 Guenter Roeck    2019-06-06  840  			/*
44e3ad882bb268 Akinobu Mita     2020-05-04  841  			 * Don't worry about hwdev; hwmon_dev_release(), called
44e3ad882bb268 Akinobu Mita     2020-05-04  842  			 * from device_unregister(), will free it.
792eac18431967 Guenter Roeck    2019-06-06  843  			 */
74e3512731bd5c Dmitry Osipenko  2018-10-24  844  			goto ida_remove;
74e3512731bd5c Dmitry Osipenko  2018-10-24  845  		}
47c332deb8e89f Linus Walleij    2017-12-05  846  	}
bab2243ce18978 Guenter Roeck    2013-07-06  847  
d560168b5d0fb4 Guenter Roeck    2015-08-26  848  	return hdev;
bab2243ce18978 Guenter Roeck    2013-07-06  849  
d560168b5d0fb4 Guenter Roeck    2015-08-26  850  free_hwmon:
3bf8bdcf3bada7 Guenter Roeck    2020-01-16 @851  	hwmon_dev_release(hdev);
bab2243ce18978 Guenter Roeck    2013-07-06  852  ida_remove:
4ca5f468cc2a0b Jonathan Cameron 2011-10-31  853  	ida_simple_remove(&hwmon_ida, id);
bab2243ce18978 Guenter Roeck    2013-07-06 @854  	return ERR_PTR(err);
bab2243ce18978 Guenter Roeck    2013-07-06  855  }

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx




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