The syzbot fuzzer reported a minor bug in the usbtmc driver:
usb 5-1: BOGUS control dir, pipe 80001e80 doesn't match bRequestType 0
WARNING: CPU: 0 PID: 3813 at drivers/usb/core/urb.c:412
usb_submit_urb+0x13a5/0x1970 drivers/usb/core/urb.c:410
Modules linked in:
CPU: 0 PID: 3813 Comm: syz-executor122 Not tainted
5.17.0-rc5-syzkaller-00306-g2293be58d6a1 #0
...
Call Trace:
<TASK>
usb_start_wait_urb+0x113/0x530 drivers/usb/core/message.c:58
usb_internal_control_msg drivers/usb/core/message.c:102 [inline]
usb_control_msg+0x2a5/0x4b0 drivers/usb/core/message.c:153
usbtmc_ioctl_request drivers/usb/class/usbtmc.c:1947 [inline]
The problem is that usbtmc_ioctl_request() uses usb_rcvctrlpipe() for
all of its transfers, whether they are in or out. It's easy to fix.
Reported-and-tested-by: syzbot+a48e3d1a875240cab5de@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
CC: <stable@xxxxxxxxxxxxxxx>
---
[as1973]
drivers/usb/class/usbtmc.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
Index: usb-devel/drivers/usb/class/usbtmc.c
===================================================================
--- usb-devel.orig/drivers/usb/class/usbtmc.c
+++ usb-devel/drivers/usb/class/usbtmc.c
@@ -1919,6 +1919,7 @@ static int usbtmc_ioctl_request(struct u
struct usbtmc_ctrlrequest request;
u8 *buffer = NULL;
int rv;
+ unsigned int is_in, pipe;
unsigned long res;
res = copy_from_user(&request, arg, sizeof(struct usbtmc_ctrlrequest));
@@ -1928,12 +1929,14 @@ static int usbtmc_ioctl_request(struct u
if (request.req.wLength > USBTMC_BUFSIZE)
return -EMSGSIZE;
+ is_in = request.req.bRequestType & USB_DIR_IN;
+
if (request.req.wLength) {
buffer = kmalloc(request.req.wLength, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
- if ((request.req.bRequestType & USB_DIR_IN) == 0) {
+ if (!is_in) {
/* Send control data to device */
res = copy_from_user(buffer, request.data,
request.req.wLength);
@@ -1944,8 +1947,12 @@ static int usbtmc_ioctl_request(struct u
}
}
+ if (is_in)
+ pipe = usb_rcvctrlpipe(data->usb_dev, 0);
+ else
+ pipe = usb_sndctrlpipe(data->usb_dev, 0);
rv = usb_control_msg(data->usb_dev,
- usb_rcvctrlpipe(data->usb_dev, 0),
+ pipe,
request.req.bRequest,
request.req.bRequestType,
request.req.wValue,
@@ -1957,7 +1964,7 @@ static int usbtmc_ioctl_request(struct u
goto exit;
}
- if (rv && (request.req.bRequestType & USB_DIR_IN)) {
+ if (rv && is_in) {
/* Read control data from device */
res = copy_to_user(request.data, buffer, rv);
if (res)
