linux-kernel - Re: 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: <20231218061046.jurwf7j2wlja6jgf@vireshk-i7>
Date: Mon, 18 Dec 2023 11:40:46 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: kernel test robot <lkp@...el.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: 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

On 17-12-23, 06:23, kernel test robot wrote:
> Hi Viresh,
> 
> FYI, the error/warning still remains.
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   3b8a9b2e6809d281890dd0a1102dc14d2cd11caf
> commit: 46f48aca2e5aef3f430e95d1a5fb68227ec8ec85 OPP: Fix missing debugfs supply directory for OPPs
> date:   5 years ago
> config: x86_64-randconfig-a006-20230623 (https://download.01.org/0day-ci/archive/20231217/202312170608.s9xI4TQb-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/20231217/202312170608.s9xI4TQb-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/202312170608.s9xI4TQb-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);
>          |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Can someone check if this happens on mainline too ? I think this is a
False report.

-- 
viresh