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patch "USB: rio500: refuse more than one device at a time" added to usb-linus

PATCH [email protected] 1 participant 1 message May 21, 2019

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This is a note to let you know that I've just added the patch titled

USB: rio500: refuse more than one device at a time

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 3864d33943b4a76c6e64616280e98d2410b1190f Mon Sep 17 00:00:00 2001
From: Oliver Neukum <[email protected]>
Date: Thu, 9 May 2019 11:30:58 +0200
Subject: USB: rio500: refuse more than one device at a time

This driver is using a global variable. It cannot handle more than one device at a time. The issue has been existing since the dawn of the driver.

Signed-off-by Oliver Neukum <[email protected]>
Reported-by [email protected]
Cc stable <[email protected]>
Signed-off-by Greg Kroah-Hartman <[email protected]>
---
 drivers/usb/misc/rio500.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)
drivers/usb/misc/rio500.c +18 -6
index 7b9adeb3e7aa..1d397d93d127 100644
@@ -447,15 +447,23 @@ static int probe_rio(struct usb_interface *intf,
 {
 	struct usb_device *dev = interface_to_usbdev(intf);
 	struct rio_usb_data *rio = &rio_instance;
-	int retval;
+	int retval = 0;
 
-	dev_info(&intf->dev, "USB Rio found at address %d\n", dev->devnum);
+	mutex_lock(&rio500_mutex);
+	if (rio->present) {
+		dev_info(&intf->dev, "Second USB Rio at address %d refused\n", dev->devnum);
+		retval = -EBUSY;
+		goto bail_out;
+	} else {
+		dev_info(&intf->dev, "USB Rio found at address %d\n", dev->devnum);
+	}
 
 	retval = usb_register_dev(intf, &usb_rio_class);
 	if (retval) {
 		dev_err(&dev->dev,
 			"Not able to get a minor for this device.\n");
-		return -ENOMEM;
+		retval = -ENOMEM;
+		goto bail_out;
 	}
 
 	rio->rio_dev = dev;

@@ -464,7 +472,8 @@ static int probe_rio(struct usb_interface *intf,
 		dev_err(&dev->dev,
 			"probe_rio: Not enough memory for the output buffer\n");
 		usb_deregister_dev(intf, &usb_rio_class);
-		return -ENOMEM;
+		retval = -ENOMEM;
+		goto bail_out;
 	}
 	dev_dbg(&intf->dev, "obuf address:%p\n", rio->obuf);
 

@@ -473,7 +482,8 @@ static int probe_rio(struct usb_interface *intf,
 			"probe_rio: Not enough memory for the input buffer\n");
 		usb_deregister_dev(intf, &usb_rio_class);
 		kfree(rio->obuf);
-		return -ENOMEM;
+		retval = -ENOMEM;
+		goto bail_out;
 	}
 	dev_dbg(&intf->dev, "ibuf address:%p\n", rio->ibuf);
 

@@ -481,8 +491,10 @@ static int probe_rio(struct usb_interface *intf,
 
 	usb_set_intfdata (intf, rio);
 	rio->present = 1;
+bail_out:
+	mutex_unlock(&rio500_mutex);
 
-	return 0;
+	return retval;
 }
 
 static void disconnect_rio(struct usb_interface *intf)
Signature · 1 line
2.21.0