Am 04.01.21 um 18:43 schrieb Alex Deucher:
Make sure the copy succeeded. Also fixes a warning.
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c
index 455978781380..1f98ce4e56f2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_securedisplay.c
@@ -101,7 +101,9 @@ static ssize_t amdgpu_securedisplay_debugfs_write(struct file *f, const char __u
return -EINVAL;
memset(str, 0, sizeof(str));
- copy_from_user(str, buf, size);
+ ret = copy_from_user(str, buf, size);
+ if (ret >= size)
+ return -EINVAL;
IIRC copy_from_user return the number of bytes which couldn't be copied.
E.g. theta should be if (ret) return -EFAULT.
Christian.
ret = pm_runtime_get_sync(dev->dev);
if (ret < 0) {
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