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Date: Wed, 27 Sep 2023 22:44:22 +0800
From: Philip Li <philip.li@...el.com>
To: Christian Marangi <ansuelsmth@...il.com>
CC: kernel test robot <lkp@...el.com>, Andrew Lunn <andrew@...n.ch>,
<oe-kbuild-all@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
Subject: Re: drivers/leds/trigger/ledtrig-netdev.c:120:34: warning: array
subscript 17 is above array bounds of 'char[16]'
On Tue, Sep 26, 2023 at 01:22:35AM +0200, Christian Marangi wrote:
> On Tue, Sep 19, 2023 at 08:21:03PM +0800, kernel test robot wrote:
> > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head: 2cf0f715623872823a72e451243bbf555d10d032
> > commit: 28a6a2ef18ad840a390d519840c303b03040961c leds: trigger: netdev: refactor code setting device name
> > date: 4 months ago
> > config: loongarch-allmodconfig (https://download.01.org/0day-ci/archive/20230919/202309192035.GTJEEbem-lkp@intel.com/config)
> > compiler: loongarch64-linux-gcc (GCC) 13.2.0
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230919/202309192035.GTJEEbem-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/202309192035.GTJEEbem-lkp@intel.com/
> >
> > All warnings (new ones prefixed by >>):
> >
> > drivers/leds/trigger/ledtrig-netdev.c: In function 'set_device_name':
> > >> drivers/leds/trigger/ledtrig-netdev.c:120:34: warning: array subscript 17 is above array bounds of 'char[16]' [-Warray-bounds=]
> > 120 | trigger_data->device_name[size] = 0;
> > | ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
> > drivers/leds/trigger/ledtrig-netdev.c:48:14: note: while referencing 'device_name'
> > 48 | char device_name[IFNAMSIZ];
> > | ^~~~~~~~~~~
> > >> drivers/leds/trigger/ledtrig-netdev.c:120:34: warning: array subscript 17 is above array bounds of 'char[16]' [-Warray-bounds=]
> > 120 | trigger_data->device_name[size] = 0;
> > | ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
> > drivers/leds/trigger/ledtrig-netdev.c:48:14: note: while referencing 'device_name'
> > 48 | char device_name[IFNAMSIZ];
> > | ^~~~~~~~~~~
> >
> >
> > vim +120 drivers/leds/trigger/ledtrig-netdev.c
> >
> > 06f502f57d0d77 Ben Whitten 2017-12-10 106
> > 28a6a2ef18ad84 Andrew Lunn 2023-05-29 107 static int set_device_name(struct led_netdev_data *trigger_data,
> > 28a6a2ef18ad84 Andrew Lunn 2023-05-29 108 const char *name, size_t size)
> > 06f502f57d0d77 Ben Whitten 2017-12-10 109 {
> > 06f502f57d0d77 Ben Whitten 2017-12-10 110 cancel_delayed_work_sync(&trigger_data->work);
> > 06f502f57d0d77 Ben Whitten 2017-12-10 111
> > d1b9e1391ab2dc Christian Marangi 2023-04-19 112 mutex_lock(&trigger_data->lock);
> > 06f502f57d0d77 Ben Whitten 2017-12-10 113
> > 06f502f57d0d77 Ben Whitten 2017-12-10 114 if (trigger_data->net_dev) {
> > 06f502f57d0d77 Ben Whitten 2017-12-10 115 dev_put(trigger_data->net_dev);
> > 06f502f57d0d77 Ben Whitten 2017-12-10 116 trigger_data->net_dev = NULL;
> > 06f502f57d0d77 Ben Whitten 2017-12-10 117 }
> > 06f502f57d0d77 Ben Whitten 2017-12-10 118
> > 28a6a2ef18ad84 Andrew Lunn 2023-05-29 119 memcpy(trigger_data->device_name, name, size);
> > 909346433064b8 Rasmus Villemoes 2019-03-14 @120 trigger_data->device_name[size] = 0;
> > 06f502f57d0d77 Ben Whitten 2017-12-10 121 if (size > 0 && trigger_data->device_name[size - 1] == '\n')
> > 06f502f57d0d77 Ben Whitten 2017-12-10 122 trigger_data->device_name[size - 1] = 0;
> > 06f502f57d0d77 Ben Whitten 2017-12-10 123
> > 06f502f57d0d77 Ben Whitten 2017-12-10 124 if (trigger_data->device_name[0] != 0)
> > 06f502f57d0d77 Ben Whitten 2017-12-10 125 trigger_data->net_dev =
> > 06f502f57d0d77 Ben Whitten 2017-12-10 126 dev_get_by_name(&init_net, trigger_data->device_name);
> > 06f502f57d0d77 Ben Whitten 2017-12-10 127
> > e2f24cb1b5daf9 Christian Marangi 2023-04-19 128 trigger_data->carrier_link_up = false;
> > 06f502f57d0d77 Ben Whitten 2017-12-10 129 if (trigger_data->net_dev != NULL)
> > e2f24cb1b5daf9 Christian Marangi 2023-04-19 130 trigger_data->carrier_link_up = netif_carrier_ok(trigger_data->net_dev);
> > 06f502f57d0d77 Ben Whitten 2017-12-10 131
> > 06f502f57d0d77 Ben Whitten 2017-12-10 132 trigger_data->last_activity = 0;
> > 06f502f57d0d77 Ben Whitten 2017-12-10 133
> > 06f502f57d0d77 Ben Whitten 2017-12-10 134 set_baseline_state(trigger_data);
> > d1b9e1391ab2dc Christian Marangi 2023-04-19 135 mutex_unlock(&trigger_data->lock);
> > 06f502f57d0d77 Ben Whitten 2017-12-10 136
> > 28a6a2ef18ad84 Andrew Lunn 2023-05-29 137 return 0;
> > 28a6a2ef18ad84 Andrew Lunn 2023-05-29 138 }
> > 28a6a2ef18ad84 Andrew Lunn 2023-05-29 139
> >
> > :::::: The code at line 120 was first introduced by commit
> > :::::: 909346433064b8d840dc82af26161926b8d37558 leds: trigger: netdev: use memcpy in device_name_store
> >
> > :::::: TO: Rasmus Villemoes <linux@...musvillemoes.dk>
> > :::::: CC: Jacek Anaszewski <jacek.anaszewski@...il.com>
> >
> > --
> > 0-DAY CI Kernel Test Service
> > https://github.com/intel/lkp-tests/wiki
>
> Can't repro so I guess this was a false-positive that got fixed? (I used
> the repro commands and doesn't print any error)
Hi Ansuel, the issue requires to build with -Warray-bounds flag. We will fix
the reproduce steps in earliest time. Sorry for the inconvenience.
>
> --
> Ansuel
>
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