linux-kernel - drivers/pci/controller/dwc/pcie-designware.c:898:50: error: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size 3

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Date:   Sat, 4 Nov 2023 18:58:05 +0800
From:   kernel test robot <lkp@...el.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
        Bjorn Helgaas <helgaas@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: drivers/pci/controller/dwc/pcie-designware.c:898:50: error: '%d'
 directive output may be truncated writing between 1 and 11 bytes into a
 region of size 3

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   90b0c2b2edd1adff742c621e246562fbefa11b70
commit: 939fbcd568fd294034c96edc92ff5b9de1a5fce8 PCI: dwc: Add Root Port and Endpoint controller eDMA engine support
date:   9 months ago
config: x86_64-sof-customedconfig-edison-defconfig (https://download.01.org/0day-ci/archive/20231104/202311041813.mTp23LXm-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/20231104/202311041813.mTp23LXm-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/202311041813.mTp23LXm-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/pci/controller/dwc/pcie-designware.c: In function 'dw_pcie_edma_detect':
>> drivers/pci/controller/dwc/pcie-designware.c:898:50: error: '%d' directive output may be truncated writing between 1 and 11 bytes into a region of size 3 [-Werror=format-truncation=]
     898 |                 snprintf(name, sizeof(name), "dma%d", pci->edma.nr_irqs);
         |                                                  ^~
   In function 'dw_pcie_edma_irq_verify',
       inlined from 'dw_pcie_edma_detect' at drivers/pci/controller/dwc/pcie-designware.c:949:8:
   drivers/pci/controller/dwc/pcie-designware.c:898:46: note: directive argument in the range [-2147483648, 22]
     898 |                 snprintf(name, sizeof(name), "dma%d", pci->edma.nr_irqs);
         |                                              ^~~~~~~
   drivers/pci/controller/dwc/pcie-designware.c:898:17: note: 'snprintf' output between 5 and 15 bytes into a destination of size 6
     898 |                 snprintf(name, sizeof(name), "dma%d", pci->edma.nr_irqs);
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: all warnings being treated as errors


vim +898 drivers/pci/controller/dwc/pcie-designware.c

   878	
   879	static int dw_pcie_edma_irq_verify(struct dw_pcie *pci)
   880	{
   881		struct platform_device *pdev = to_platform_device(pci->dev);
   882		u16 ch_cnt = pci->edma.ll_wr_cnt + pci->edma.ll_rd_cnt;
   883		char name[6];
   884		int ret;
   885	
   886		if (pci->edma.nr_irqs == 1)
   887			return 0;
   888		else if (pci->edma.nr_irqs > 1)
   889			return pci->edma.nr_irqs != ch_cnt ? -EINVAL : 0;
   890	
   891		ret = platform_get_irq_byname_optional(pdev, "dma");
   892		if (ret > 0) {
   893			pci->edma.nr_irqs = 1;
   894			return 0;
   895		}
   896	
   897		for (; pci->edma.nr_irqs < ch_cnt; pci->edma.nr_irqs++) {
 > 898			snprintf(name, sizeof(name), "dma%d", pci->edma.nr_irqs);
   899	
   900			ret = platform_get_irq_byname_optional(pdev, name);
   901			if (ret <= 0)
   902				return -EINVAL;
   903		}
   904	
   905		return 0;
   906	}
   907	

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