linux-kernel - arch/s390/kernel/ipl.c:1973 sys_vmcmd_on_reboot_store() warn: unsigned 'len' is never less than zero.

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Message-ID: <202412081614.5uel8F6W-lkp@intel.com>
Date: Mon, 9 Dec 2024 12:44:58 +0800
From: kernel test robot <lkp@...el.com>
To: Alexander Egorenkov <egorenar@...ux.ibm.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>
Subject: arch/s390/kernel/ipl.c:1973 sys_vmcmd_on_reboot_store() warn:
 unsigned 'len' is never less than zero.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   7503345ac5f5e82fd9a36d6e6b447c016376403a
commit: 247576bf624a200b9d4dba6126e760af0d5ebe0e s390/ipl: Do not accept z/VM CP diag X'008' cmds longer than max length
date:   7 months ago
config: s390-randconfig-r071-20241208 (https://download.01.org/0day-ci/archive/20241208/202412081614.5uel8F6W-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 14.2.0

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>
| Closes: https://lore.kernel.org/oe-kbuild-all/202412081614.5uel8F6W-lkp@intel.com/

smatch warnings:
arch/s390/kernel/ipl.c:1973 sys_vmcmd_on_reboot_store() warn: unsigned 'len' is never less than zero.
arch/s390/kernel/ipl.c:1974 sys_vmcmd_on_panic_store() warn: unsigned 'len' is never less than zero.
arch/s390/kernel/ipl.c:1975 sys_vmcmd_on_halt_store() warn: unsigned 'len' is never less than zero.
arch/s390/kernel/ipl.c:1976 sys_vmcmd_on_poff_store() warn: unsigned 'len' is never less than zero.
arch/s390/kernel/ipl.c:1977 sys_vmcmd_on_restart_store() warn: unsigned 'len' is never less than zero.

vim +/len +1973 arch/s390/kernel/ipl.c

99ca4e582d4a408 Michael Holzheu 2008-01-26  1972  
99ca4e582d4a408 Michael Holzheu 2008-01-26 @1973  DEFINE_IPL_ATTR_STR_RW(vmcmd, on_reboot, "%s\n", "%s\n", vmcmd_on_reboot);
99ca4e582d4a408 Michael Holzheu 2008-01-26 @1974  DEFINE_IPL_ATTR_STR_RW(vmcmd, on_panic, "%s\n", "%s\n", vmcmd_on_panic);
99ca4e582d4a408 Michael Holzheu 2008-01-26 @1975  DEFINE_IPL_ATTR_STR_RW(vmcmd, on_halt, "%s\n", "%s\n", vmcmd_on_halt);
99ca4e582d4a408 Michael Holzheu 2008-01-26 @1976  DEFINE_IPL_ATTR_STR_RW(vmcmd, on_poff, "%s\n", "%s\n", vmcmd_on_poff);
7dd6b3343fdc190 Michael Holzheu 2011-08-03 @1977  DEFINE_IPL_ATTR_STR_RW(vmcmd, on_restart, "%s\n", "%s\n", vmcmd_on_restart);
99ca4e582d4a408 Michael Holzheu 2008-01-26  1978  

:::::: The code at line 1973 was first introduced by commit
:::::: 99ca4e582d4a4088969681efff97be44d98421a1 [S390] kernel: Shutdown Actions Interface

:::::: TO: Michael Holzheu <holzheu@...ibm.com>
:::::: CC: Martin Schwidefsky <schwidefsky@...ibm.com>

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