linux-kernel - drivers/opp/debugfs.c:48:54: warning: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size 8

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Message-ID: <202311061847.BOtfUmbQ-lkp@intel.com>
Date:   Mon, 6 Nov 2023 18:41:37 +0800
From:   kernel test robot <lkp@...el.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: drivers/opp/debugfs.c:48:54: warning: '%d' directive output may be
 truncated writing between 1 and 11 bytes into a region of size 8

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d2f51b3516dade79269ff45eae2a7668ae711b25
commit: 46f48aca2e5aef3f430e95d1a5fb68227ec8ec85 OPP: Fix missing debugfs supply directory for OPPs
date:   4 years, 11 months ago
config: x86_64-randconfig-r025-20230725 (https://download.01.org/0day-ci/archive/20231106/202311061847.BOtfUmbQ-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231106/202311061847.BOtfUmbQ-lkp@intel.com/reproduce)

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>
| Closes: https://lore.kernel.org/oe-kbuild-all/202311061847.BOtfUmbQ-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/opp/debugfs.c: In function 'opp_debug_create_one':
>> drivers/opp/debugfs.c:48:54: warning: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size 8 [-Wformat-truncation=]
      48 |                 snprintf(name, sizeof(name), "supply-%d", i);
         |                                                      ^~
   In function 'opp_debug_create_supplies',
       inlined from 'opp_debug_create_one' at drivers/opp/debugfs.c:119:7:
   drivers/opp/debugfs.c:48:46: note: directive argument in the range [-2147483644, 2147483646]
      48 |                 snprintf(name, sizeof(name), "supply-%d", i);
         |                                              ^~~~~~~~~~~
   drivers/opp/debugfs.c:48:17: note: 'snprintf' output between 9 and 19 bytes into a destination of size 15
      48 |                 snprintf(name, sizeof(name), "supply-%d", i);
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +48 drivers/opp/debugfs.c

deaa51465105a7 drivers/base/power/opp/debugfs.c Viresh Kumar 2015-11-11  37  
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  38  static bool opp_debug_create_supplies(struct dev_pm_opp *opp,
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  39  				      struct opp_table *opp_table,
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  40  				      struct dentry *pdentry)
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  41  {
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  42  	struct dentry *d;
1fae788ed640e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2017-05-23  43  	int i;
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  44  
1fae788ed640e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2017-05-23  45  	for (i = 0; i < opp_table->regulator_count; i++) {
d741029a239040 drivers/opp/debugfs.c            Arvind Yadav 2017-09-21  46  		char name[15];
d741029a239040 drivers/opp/debugfs.c            Arvind Yadav 2017-09-21  47  
d741029a239040 drivers/opp/debugfs.c            Arvind Yadav 2017-09-21 @48  		snprintf(name, sizeof(name), "supply-%d", i);
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  49  
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  50  		/* Create per-opp directory */
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  51  		d = debugfs_create_dir(name, pdentry);
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  52  
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  53  		if (!d)
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  54  			return false;
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  55  
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  56  		if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d,
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  57  					  &opp->supplies[i].u_volt))
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  58  			return false;
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  59  
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  60  		if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d,
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  61  					  &opp->supplies[i].u_volt_min))
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  62  			return false;
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  63  
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  64  		if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d,
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  65  					  &opp->supplies[i].u_volt_max))
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  66  			return false;
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  67  
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  68  		if (!debugfs_create_ulong("u_amp", S_IRUGO, d,
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  69  					  &opp->supplies[i].u_amp))
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  70  			return false;
1fae788ed640e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2017-05-23  71  	}
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  72  
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  73  	return true;
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  74  }
dfbe4678d709e2 drivers/base/power/opp/debugfs.c Viresh Kumar 2016-12-01  75  

:::::: The code at line 48 was first introduced by commit
:::::: d741029a2390406d4d94279ae5b346831a9e61e6 PM / OPP: Use snprintf() to avoid kasprintf() and kfree()

:::::: TO: Arvind Yadav <arvind.yadav.cs@...il.com>
:::::: CC: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

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https://github.com/intel/lkp-tests/wiki