[PATCH] drm/amdgpu: Fix ras debugfs data parse

[Pan, Xinhui]

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

Signed-off-by: xinhui pan <xinhui.pan at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c
index 74a65a61fd23..a5336d16aa4d 100644
--- 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;
--
2.17.1
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