habanalabs: check pad and reserved fields in ioctls

Make sure all reserved/pad fields in uapi input structures
are set to 0.
Signed-off-by: farah kassabri <fkassabri@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

drivers/accel/habanalabs/common/command_submission.c

@@ -1310,6 +1310,13 @@ static int hl_cs_sanity_checks(struct hl_fpriv *hpriv, union hl_cs_args *args)
 	enum hl_device_status status;
 	enum hl_cs_type cs_type;
 	bool is_sync_stream;
+	int i;
+
+	for (i = 0 ; i < sizeof(args->in.pad) ; i++)
+		if (args->in.pad[i]) {
+			dev_dbg(hdev->dev, "Padding bytes must be 0\n");
+			return -EINVAL;
+		}
 
 	if (!hl_device_operational(hdev, &status)) {
 		return -EBUSY;
@@ -2918,7 +2925,13 @@ static int hl_multi_cs_wait_ioctl(struct hl_fpriv *hpriv, void *data)
 	u32 size_to_copy;
 	u64 *cs_seq_arr;
 	u8 seq_arr_len;
-	int rc;
+	int rc, i;
+
+	for (i = 0 ; i < sizeof(args->in.pad) ; i++)
+		if (args->in.pad[i]) {
+			dev_dbg(hdev->dev, "Padding bytes must be 0\n");
+			return -EINVAL;
+		}
 
 	if (!hdev->supports_wait_for_multi_cs) {
 		dev_err(hdev->dev, "Wait for multi CS is not supported\n");

drivers/accel/habanalabs/common/habanalabs_ioctl.c

@@ -884,9 +884,13 @@ static int _hl_info_ioctl(struct hl_fpriv *hpriv, void *data,
 	enum hl_device_status status;
 	struct hl_info_args *args = data;
 	struct hl_device *hdev = hpriv->hdev;
-
 	int rc;
 
+	if (args->pad) {
+		dev_dbg(hdev->dev, "Padding bytes must be 0\n");
+		return -EINVAL;
+	}
+
 	/*
 	 * Information is returned for the following opcodes even if the device
 	 * is disabled or in reset.