drm/amdgpu: Fix truncation in smu_v11_0_init_microcode

Reducing the size of ucode_prefix to 25 in the smu_v11_0_init_microcode
function. we ensure that fw_name can accommodate the maximum possible
string size

Fixes the below with gcc W=1:
drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/smu_v11_0.c: In function ‘smu_v11_0_init_microcode’:
drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/smu_v11_0.c:110:54: warning: ‘.bin’ directive output may be truncated writing 4 bytes into a region of size between 0 and 29 [-Wformat-truncation=]
  110 |         snprintf(fw_name, sizeof(fw_name), "amdgpu/%s.bin", ucode_prefix);
      |                                                      ^~~~
drivers/gpu/drm/amd/amdgpu/../pm/swsmu/smu11/smu_v11_0.c:110:9: note: ‘snprintf’ output between 12 and 41 bytes into a destination of size 36
  110 |         snprintf(fw_name, sizeof(fw_name), "amdgpu/%s.bin", ucode_prefix);
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Cc: Alex Deucher <[email protected]>
Cc: Christian König <[email protected]>
Suggested-by: Lijo Lazar <[email protected]>
Signed-off-by: Srinivasan Shanmugam <[email protected]>
Reviewed-by: Lijo Lazar <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c
index f6545093bfc1..5e5da9b16718 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/smu_v11_0.c
@@ -93,7 +93,7 @@ static void smu_v11_0_poll_baco_exit(struct smu_context *smu)
 int smu_v11_0_init_microcode(struct smu_context *smu)
 {
 	struct amdgpu_device *adev = smu->adev;
-	char ucode_prefix[30];
+	char ucode_prefix[25];
 	char fw_name[SMU_FW_NAME_LEN];
 	int err = 0;
 	const struct smc_firmware_header_v1_0 *hdr;