drm/amdgpu: Fix ras debugfs data parse

Unzero char is accepted by sscanf, so when data is structure but
unexpectedly return error invalid;

Signed-off-by: xinhui pan <xinhui.pan@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index 74a65a6..1acaa84 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
@@ -241,7 +241,7 @@ static int amdgpu_ras_debugfs_ctrl_parse_data(struct file *f,
                op = 1;
        else if (sscanf(str, "inject %32s %8s", block_name, err) == 2)
                op = 2;
-       else if (sscanf(str, "%32s", block_name) == 1)
+       else if (str[0] && str[1] && str[2] && str[3])
                /* ascii string, but commands are not matched. */
                return -EINVAL;