drm/amd/amdgpu: Fix 'snprintf' output truncation warning

snprintf can truncate the output fw filename if the isp ucode_prefix
exceeds 29 characters. Knowing ISP ucode_prefix is in the format
isp_x_x_x, limiting the size of ucode_prefix[] to 10 characters
to fix the warning.

Fixes the below warning:

   drivers/gpu/drm/amd/amdgpu/amdgpu_isp.c: In function 'isp_early_init':
   drivers/gpu/drm/amd/amdgpu/amdgpu_isp.c:192:58: warning: 'snprintf'
   output may be truncated before the last format character
   [-Wformat-truncation=]
     192 |         snprintf(fw_name, sizeof(fw_name), "amdgpu/%s.bin", ucode_prefix);
         |                                                          ^
   In function 'isp_load_fw_by_psp',
       inlined from 'isp_early_init' at drivers/gpu/drm/amd/amdgpu/amdgpu_isp.c:218:8:
   drivers/gpu/drm/amd/amdgpu/amdgpu_isp.c:192:9: note: 'snprintf' output between 12 and 41 bytes into a destination of size 40
     192 |         snprintf(fw_name, sizeof(fw_name), "amdgpu/%s.bin", ucode_prefix);
         |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Pratap Nirujogi <pratap.nirujogi@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_isp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_isp.c
index 240408486d6b4a1fa964380545c1b52e9479264b..2a3f4668cb9b5d5f60e71a1de164bf1d8f9a551e 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_isp.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_isp.c
@@ -96,7 +96,7 @@ static int isp_resume(void *handle)
 static int isp_load_fw_by_psp(struct amdgpu_device *adev)
 {
        const struct common_firmware_header *hdr;
-       char ucode_prefix[30];
+       char ucode_prefix[10];
        char fw_name[40];
        int r = 0;