On 3/20/2024 2:15 PM, Srinivasan Shanmugam wrote:
> The issue was present in the lines where 'fw_name' was being formatted.
> This fix ensures that the output is not truncated
>
> Fixes the below with gcc W=1:
> 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: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);
> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Cc: Alex Deucher <alexander.deucher@xxxxxxx>
> Cc: Christian König <christian.koenig@xxxxxxx>
> Suggested-by: Lijo Lazar <lijo.lazar@xxxxxxx>
> Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
> index 9c514a606a2f..f994ee6c548d 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
> @@ -94,7 +94,7 @@ static void amdgpu_vcn_idle_work_handler(struct work_struct *work);
> int amdgpu_vcn_early_init(struct amdgpu_device *adev)
> {
> char ucode_prefix[30];
Hi Srini,
Sorry, if I miscommunicated. Suggestion was to reduce prefix size to 25
as the max prefix length is possibly length of dimgrey_cavefish_vcn.
With fw_name[42] also, you may run into 43 bytes (30 prefix + 13 for
others) warning.
Thanks,
Lijo
> - char fw_name[40];
> + char fw_name[42];
> int r, i;
>
> for (i = 0; i < adev->vcn.num_vcn_inst; i++) {
