1 files changed, 25 insertions, 31 deletions

diff --git a/drivers/hid/hid-ft260.c b/drivers/hid/hid-ft260.c
index a5751607ce24..4ef1c3b8094e 100644
--- a/drivers/hid/hid-ft260.c
+++ b/drivers/hid/hid-ft260.c
@@ -201,7 +201,7 @@ struct ft260_i2c_write_request_report {
 	u8 address;		/* 7-bit I2C address */
 	u8 flag;		/* I2C transaction condition */
 	u8 length;		/* data payload length */
-	u8 data[60];		/* data payload */
+	u8 data[FT260_WR_DATA_MAX]; /* data payload */
 } __packed;
 
 struct ft260_i2c_read_request_report {
@@ -249,7 +249,10 @@ static int ft260_hid_feature_report_get(struct hid_device *hdev,
 
 	ret = hid_hw_raw_request(hdev, report_id, buf, len, HID_FEATURE_REPORT,
 				 HID_REQ_GET_REPORT);
-	memcpy(data, buf, len);
+	if (likely(ret == len))
+		memcpy(data, buf, len);
+	else if (ret >= 0)
+		ret = -EIO;
 	kfree(buf);
 	return ret;
 }
@@ -298,7 +301,7 @@ static int ft260_xfer_status(struct ft260_device *dev)
 
 	ret = ft260_hid_feature_report_get(hdev, FT260_I2C_STATUS,
 					   (u8 *)&report, sizeof(report));
-	if (ret < 0) {
+	if (unlikely(ret < 0)) {
 		hid_err(hdev, "failed to retrieve status: %d\n", ret);
 		return ret;
 	}
@@ -429,6 +432,9 @@ static int ft260_smbus_write(struct ft260_device *dev, u8 addr, u8 cmd,
 	struct ft260_i2c_write_request_report *rep =
 		(struct ft260_i2c_write_request_report *)dev->write_buf;
 
+	if (data_len >= sizeof(rep->data))
+		return -EINVAL;
+
 	rep->address = addr;
 	rep->data[0] = cmd;
 	rep->length = data_len + 1;
@@ -721,10 +727,9 @@ static int ft260_get_system_config(struct hid_device *hdev,
 
 	ret = ft260_hid_feature_report_get(hdev, FT260_SYSTEM_SETTINGS,
 					   (u8 *)cfg, len);
-	if (ret != len) {
+	if (ret < 0) {
 		hid_err(hdev, "failed to retrieve system status\n");
-		if (ret >= 0)
-			return -EIO;
+		return ret;
 	}
 	return 0;
 }
@@ -737,7 +742,7 @@ static int ft260_is_interface_enabled(struct hid_device *hdev)
 	int ret;
 
 	ret = ft260_get_system_config(hdev, &cfg);
-	if (ret)
+	if (ret < 0)
 		return ret;
 
 	ft260_dbg("interface:  0x%02x\n", interface);
@@ -749,23 +754,16 @@ static int ft260_is_interface_enabled(struct hid_device *hdev)
 	switch (cfg.chip_mode) {
 	case FT260_MODE_ALL:
 	case FT260_MODE_BOTH:
-		if (interface == 1) {
+		if (interface == 1)
 			hid_info(hdev, "uart interface is not supported\n");
-			return 0;
-		}
-		ret = 1;
+		else
+			ret = 1;
 		break;
 	case FT260_MODE_UART:
-		if (interface == 0) {
-			hid_info(hdev, "uart is unsupported on interface 0\n");
-			ret = 0;
-		}
+		hid_info(hdev, "uart interface is not supported\n");
 		break;
 	case FT260_MODE_I2C:
-		if (interface == 1) {
-			hid_info(hdev, "i2c is unsupported on interface 1\n");
-			ret = 0;
-		}
+		ret = 1;
 		break;
 	}
 	return ret;
@@ -777,10 +775,10 @@ static int ft260_byte_show(struct hid_device *hdev, int id, u8 *cfg, int len,
 	int ret;
 
 	ret = ft260_hid_feature_report_get(hdev, id, cfg, len);
-	if (ret != len && ret >= 0)
-		return -EIO;
+	if (ret < 0)
+		return ret;
 
-	return scnprintf(buf, PAGE_SIZE, "%hi\n", *field);
+	return scnprintf(buf, PAGE_SIZE, "%d\n", *field);
 }
 
 static int ft260_word_show(struct hid_device *hdev, int id, u8 *cfg, int len,
@@ -789,10 +787,10 @@ static int ft260_word_show(struct hid_device *hdev, int id, u8 *cfg, int len,
 	int ret;
 
 	ret = ft260_hid_feature_report_get(hdev, id, cfg, len);
-	if (ret != len && ret >= 0)
-		return -EIO;
+	if (ret < 0)
+		return ret;
 
-	return scnprintf(buf, PAGE_SIZE, "%hi\n", le16_to_cpu(*field));
+	return scnprintf(buf, PAGE_SIZE, "%d\n", le16_to_cpu(*field));
 }
 
 #define FT260_ATTR_SHOW(name, reptype, id, type, func)			       \
@@ -941,10 +939,8 @@ static int ft260_probe(struct hid_device *hdev, const struct hid_device_id *id)
 
 	ret = ft260_hid_feature_report_get(hdev, FT260_CHIP_VERSION,
 					   (u8 *)&version, sizeof(version));
-	if (ret != sizeof(version)) {
+	if (ret < 0) {
 		hid_err(hdev, "failed to retrieve chip version\n");
-		if (ret >= 0)
-			ret = -EIO;
 		goto err_hid_close;
 	}
 
@@ -1001,11 +997,9 @@ err_hid_stop:
 
 static void ft260_remove(struct hid_device *hdev)
 {
-	int ret;
 	struct ft260_device *dev = hid_get_drvdata(hdev);
 
-	ret = ft260_is_interface_enabled(hdev);
-	if (ret <= 0)
+	if (!dev)
 		return;
 
 	sysfs_remove_group(&hdev->dev.kobj, &ft260_attr_group);