[linux-next:master 13404/13571] drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c:105:73: warning: '.bin' directive output may be truncated writing 4 bytes into a region of size between 2 and 31

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   9bb9b28d0568991b1d63e66fe75afa5f97ad1156
commit: b041fcaa26186dcfc121bcb9db285d6c73fd74e3 [13404/13571] drm/amdgpu/vcn: enable vcn1 fw load for VCN 4_0_6
config: loongarch-defconfig (https://download.01.org/0day-ci/archive/20240315/202403151008.QYEoXojA-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/20240315/202403151008.QYEoXojA-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202403151008.QYEoXojA-lkp@intel.com/

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c: In function 'amdgpu_vcn_early_init':
   drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c:102:66: warning: 'snprintf' output may be truncated before the last format character [-Wformat-truncation=]
     102 |                 snprintf(fw_name, sizeof(fw_name), "amdgpu/%s.bin", ucode_prefix);
         |                                                                  ^
   drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c:102:17: note: 'snprintf' output between 12 and 41 bytes into a destination of size 40
     102 |                 snprintf(fw_name, sizeof(fw_name), "amdgpu/%s.bin", ucode_prefix);
         |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c:105:73: warning: '.bin' directive output may be truncated writing 4 bytes into a region of size between 2 and 31 [-Wformat-truncation=]
     105 |                         snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_%d.bin", ucode_prefix, i);
         |                                                                         ^~~~
   drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c:105:25: note: 'snprintf' output between 14 and 43 bytes into a destination of size 40
     105 |                         snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_%d.bin", ucode_prefix, i);
         |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +105 drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c

    93	
    94	int amdgpu_vcn_early_init(struct amdgpu_device *adev)
    95	{
    96		char ucode_prefix[30];
    97		char fw_name[40];
    98		int r, i;
    99	
   100		for (i = 0; i < adev->vcn.num_vcn_inst; i++) {
   101			amdgpu_ucode_ip_version_decode(adev, UVD_HWIP, ucode_prefix, sizeof(ucode_prefix));
   102			snprintf(fw_name, sizeof(fw_name), "amdgpu/%s.bin", ucode_prefix);
   103			if (amdgpu_ip_version(adev, UVD_HWIP, 0) ==  IP_VERSION(4, 0, 6) &&
   104				i == 1) {
 > 105				snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_%d.bin", ucode_prefix, i);
   106			}
   107	
   108			r = amdgpu_ucode_request(adev, &adev->vcn.fw[i], fw_name);
   109			if (r) {
   110				amdgpu_ucode_release(&adev->vcn.fw[i]);
   111				return r;
   112			}
   113		}
   114		return r;
   115	}
   116	

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