[PATCH 6.18.y 1/2] usb: iowarrior: remove inherent race with minor number

[Sasha Levin <sashal@kernel.org>]

From: Oliver Neukum <oneukum@suse.com>

[ Upstream commit 56dd29088c9d9510c48a8ebad2465248fde36551 ]

The driver saves the minor number it gets upon registration
in its descriptor for debugging purposes. However, there is
inevitably a window between registration and saving the correct
minor in a descriptor. During this window the debugging output
will be wrong.
As wrong debug output is worse than no debug output, just
remove it.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Link: https://patch.msgid.link/20260312094619.1590556-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: c602254ba4c1 ("USB: iowarrior: fix use-after-free on disconnect race")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/misc/iowarrior.c | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)

diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
index 38f6dcdfd7fb91..f9266ae8164100 100644
--- a/drivers/usb/misc/iowarrior.c
+++ b/drivers/usb/misc/iowarrior.c
@@ -74,7 +74,6 @@ struct iowarrior {
 	struct mutex mutex;			/* locks this structure */
 	struct usb_device *udev;		/* save off the usb device pointer */
 	struct usb_interface *interface;	/* the interface for this device */
-	unsigned char minor;			/* the starting minor number for this device */
 	struct usb_endpoint_descriptor *int_out_endpoint;	/* endpoint for reading (needed for IOW56 only) */
 	struct usb_endpoint_descriptor *int_in_endpoint;	/* endpoint for reading */
 	struct urb *int_in_urb;		/* the urb for reading data */
@@ -246,7 +245,6 @@ static void iowarrior_write_callback(struct urb *urb)
  */
 static inline void iowarrior_delete(struct iowarrior *dev)
 {
-	dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
 	kfree(dev->int_in_buffer);
 	usb_free_urb(dev->int_in_urb);
 	kfree(dev->read_queue);
@@ -297,9 +295,6 @@ static ssize_t iowarrior_read(struct file *file, char __user *buffer,
 		goto exit;
 	}
 
-	dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
-		dev->minor, count);
-
 	/* read count must be packet size (+ time stamp) */
 	if ((count != dev->report_size)
 	    && (count != (dev->report_size + 1))) {
@@ -379,8 +374,6 @@ static ssize_t iowarrior_write(struct file *file,
 		retval = -ENODEV;
 		goto exit;
 	}
-	dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
-		dev->minor, count);
 	/* if count is 0 we're already done */
 	if (count == 0) {
 		retval = 0;
@@ -523,9 +516,6 @@ static long iowarrior_ioctl(struct file *file, unsigned int cmd,
 		goto error_out;
 	}
 
-	dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n",
-		dev->minor, cmd, arg);
-
 	retval = 0;
 	switch (cmd) {
 	case IOW_WRITE:
@@ -671,8 +661,6 @@ static int iowarrior_release(struct inode *inode, struct file *file)
 	if (!dev)
 		return -ENODEV;
 
-	dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
-
 	/* lock our device */
 	mutex_lock(&dev->mutex);
 
@@ -775,6 +763,7 @@ static int iowarrior_probe(struct usb_interface *interface,
 	struct usb_host_interface *iface_desc;
 	int retval = -ENOMEM;
 	int res;
+	int minor;
 
 	/* allocate memory for our device state and initialize it */
 	dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL);
@@ -890,12 +879,12 @@ static int iowarrior_probe(struct usb_interface *interface,
 		goto error;
 	}
 
-	dev->minor = interface->minor;
+	minor = interface->minor;
 
 	/* let the user know what node this device is now attached to */
 	dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d "
 		 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial,
-		 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE);
+		 iface_desc->desc.bInterfaceNumber, minor - IOWARRIOR_MINOR_BASE);
 	return retval;
 
 error:
-- 
2.53.0