linux-kernel - drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0.c:104:52: warning: '%s' directive output may be truncated writing up to 29 bytes into a region of size 23

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Date: Fri, 29 Dec 2023 07:02:49 +0800
From: kernel test robot <lkp@...el.com>
To: Evan Quan <evan.quan@....com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Alex Deucher <alexander.deucher@....com>,
	Lijo Lazar <lijo.lazar@....com>,
	Hawking Zhang <Hawking.Zhang@....com>
Subject: drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0.c:104:52:
 warning: '%s' directive output may be truncated writing up to 29 bytes into
 a region of size 23

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   505e701c0b2cfa9e34811020829759b7663a604c
commit: 276c03a0547068026241decd2c1159df0be5941f drm/amd/smu: Update SMU13 support for SMU 13.0.0
date:   1 year, 8 months ago
config: x86_64-randconfig-x066-20230529 (https://download.01.org/0day-ci/archive/20231229/202312290653.xdMUAh0o-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/20231229/202312290653.xdMUAh0o-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/202312290653.xdMUAh0o-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0.c: In function 'smu_v13_0_init_microcode':
>> drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0.c:104:52: warning: '%s' directive output may be truncated writing up to 29 bytes into a region of size 23 [-Wformat-truncation=]
     104 |         snprintf(fw_name, sizeof(fw_name), "amdgpu/%s.bin", chip_name);
         |                                                    ^~
   drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0.c:104:9: note: 'snprintf' output between 12 and 41 bytes into a destination of size 30
     104 |         snprintf(fw_name, sizeof(fw_name), "amdgpu/%s.bin", chip_name);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +104 drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu13/smu_v13_0.c

    76	
    77	static int smu_v13_0_get_pptable_from_firmware(struct smu_context *smu, void **table, uint32_t *size,
    78						       uint32_t pptable_id);
    79	
    80	int smu_v13_0_init_microcode(struct smu_context *smu)
    81	{
    82		struct amdgpu_device *adev = smu->adev;
    83		const char *chip_name;
    84		char fw_name[30];
    85		char ucode_prefix[30];
    86		int err = 0;
    87		const struct smc_firmware_header_v1_0 *hdr;
    88		const struct common_firmware_header *header;
    89		struct amdgpu_firmware_info *ucode = NULL;
    90	
    91		/* doesn't need to load smu firmware in IOV mode */
    92		if (amdgpu_sriov_vf(adev))
    93			return 0;
    94	
    95		switch (adev->ip_versions[MP1_HWIP][0]) {
    96		case IP_VERSION(13, 0, 2):
    97			chip_name = "aldebaran_smc";
    98			break;
    99		default:
   100			amdgpu_ucode_ip_version_decode(adev, MP1_HWIP, ucode_prefix, sizeof(ucode_prefix));
   101			chip_name = ucode_prefix;
   102		}
   103	
 > 104		snprintf(fw_name, sizeof(fw_name), "amdgpu/%s.bin", chip_name);
   105	
   106		err = request_firmware(&adev->pm.fw, fw_name, adev->dev);
   107		if (err)
   108			goto out;
   109		err = amdgpu_ucode_validate(adev->pm.fw);
   110		if (err)
   111			goto out;
   112	
   113		hdr = (const struct smc_firmware_header_v1_0 *) adev->pm.fw->data;
   114		amdgpu_ucode_print_smc_hdr(&hdr->header);
   115		adev->pm.fw_version = le32_to_cpu(hdr->header.ucode_version);
   116	
   117		if (adev->firmware.load_type == AMDGPU_FW_LOAD_PSP) {
   118			ucode = &adev->firmware.ucode[AMDGPU_UCODE_ID_SMC];
   119			ucode->ucode_id = AMDGPU_UCODE_ID_SMC;
   120			ucode->fw = adev->pm.fw;
   121			header = (const struct common_firmware_header *)ucode->fw->data;
   122			adev->firmware.fw_size +=
   123				ALIGN(le32_to_cpu(header->ucode_size_bytes), PAGE_SIZE);
   124		}
   125	
   126	out:
   127		if (err) {
   128			DRM_ERROR("smu_v13_0: Failed to load firmware \"%s\"\n",
   129				  fw_name);
   130			release_firmware(adev->pm.fw);
   131			adev->pm.fw = NULL;
   132		}
   133		return err;
   134	}
   135	

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