[PATCH v2 07/11] sound: 6fire: move to use usb_control_msg_send() and usb_control_msg_recv()

Greg Kroah-Hartman
2020-09-07T15:33:48Z

The usb_control_msg_send() and usb_control_msg_recv() calls can return
an error if a "short" write/read happens, so move the driver over to
using those calls instead, saving some logic in the wrapper functions
that were being used in this driver.

This also resolves a long-staging bug where data on the stack was being
sent in a USB control message, which was not allowed.

Cc: Jaroslav Kysela <perex@perex.cz>
Cc: alsa-devel@alsa-project.org
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
v2:
- Added reviewed-by from Takashi

sound/usb/6fire/firmware.c | 38 +++++++++++++-------------------------
1 file changed, 13 insertions(+), 25 deletions(-)

diff --git a/sound/usb/6fire/firmware.c b/sound/usb/6fire/firmware.c
index 69137c14d0dc..5b8994070c96 100644
--- a/sound/usb/6fire/firmware.c
+++ b/sound/usb/6fire/firmware.c
@@ -158,29 +158,17 @@ static int usb6fire_fw_ihex_init(const struct firmware *fw,
static int usb6fire_fw_ezusb_write(struct usb_device *device,
int type, int value, char *data, int len)
{
- int ret;
-
- ret = usb_control_msg(device, usb_sndctrlpipe(device, 0), type,
- USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
- value, 0, data, len, HZ);
- if (ret < 0)
- return ret;
- else if (ret != len)
- return -EIO;
- return 0;
+ return usb_control_msg_send(device, 0, type,
+ USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ value, 0, data, len, HZ);
}

static int usb6fire_fw_ezusb_read(struct usb_device *device,
int type, int value, char *data, int len)
{
- int ret = usb_control_msg(device, usb_rcvctrlpipe(device, 0), type,
- USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, value,
- 0, data, len, HZ);
- if (ret < 0)
- return ret;
- else if (ret != len)
- return -EIO;
- return 0;
+ return usb_control_msg_recv(device, 0, type,
+ USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ value, 0, data, len, HZ);
}

static int usb6fire_fw_fpga_write(struct usb_device *device,
@@ -230,7 +218,7 @@ static int usb6fire_fw_ezusb_upload(
/* upload firmware image */
data = 0x01; /* stop ezusb cpu */
ret = usb6fire_fw_ezusb_write(device, 0xa0, 0xe600, &data, 1);
- if (ret < 0) {
+ if (ret) {
kfree(rec);
release_firmware(fw);
dev_err(&intf->dev,
@@ -242,7 +230,7 @@ static int usb6fire_fw_ezusb_upload(
while (usb6fire_fw_ihex_next_record(rec)) { /* write firmware */
ret = usb6fire_fw_ezusb_write(device, 0xa0, rec->address,
rec->data, rec->len);
- if (ret < 0) {
+ if (ret) {
kfree(rec);
release_firmware(fw);
dev_err(&intf->dev,
@@ -257,7 +245,7 @@ static int usb6fire_fw_ezusb_upload(
if (postdata) { /* write data after firmware has been uploaded */
ret = usb6fire_fw_ezusb_write(device, 0xa0, postaddr,
postdata, postlen);
- if (ret < 0) {
+ if (ret) {
dev_err(&intf->dev,
"unable to upload ezusb firmware %s: post urb.\n",
fwname);
@@ -267,7 +255,7 @@ static int usb6fire_fw_ezusb_upload(

data = 0x00; /* resume ezusb cpu */
ret = usb6fire_fw_ezusb_write(device, 0xa0, 0xe600, &data, 1);
- if (ret < 0) {
+ if (ret) {
dev_err(&intf->dev,
"unable to upload ezusb firmware %s: end message.\n",
fwname);
@@ -302,7 +290,7 @@ static int usb6fire_fw_fpga_upload(
end = fw->data + fw->size;

ret = usb6fire_fw_ezusb_write(device, 8, 0, NULL, 0);
- if (ret < 0) {
+ if (ret) {
kfree(buffer);
release_firmware(fw);
dev_err(&intf->dev,
@@ -327,7 +315,7 @@ static int usb6fire_fw_fpga_upload(
kfree(buffer);

ret = usb6fire_fw_ezusb_write(device, 9, 0, NULL, 0);
- if (ret < 0) {
+ if (ret) {
dev_err(&intf->dev,
"unable to upload fpga firmware: end urb.\n");
return ret;
@@ -363,7 +351,7 @@ int usb6fire_fw_init(struct usb_interface *intf)
u8 buffer[12];

ret = usb6fire_fw_ezusb_read(device, 1, 0, buffer, 8);
- if (ret < 0) {
+ if (ret) {
dev_err(&intf->dev,
"unable to receive device firmware state.\n");
return ret;
--
2.28.0