linux-kernel - Re: general protection fault in __dev

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Date:   Mon, 22 Apr 2019 12:07:19 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     syzbot <syzbot+2eb9121678bdb36e6d57@...kaller.appspotmail.com>
cc:     andreyknvl@...gle.com, <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <rafael@...nel.org>, <syzkaller-bugs@...glegroups.com>
Subject: Re: general protection fault in __dev_printk

On Mon, 22 Apr 2019, syzbot wrote:

> Hello,
> 
> syzbot tried to test the proposed patch but build/boot failed:

Typo in the patch (missing comma).  Let's try again.

Alan Stern


#syz test: https://github.com/google/kasan.git usb-fuzzer

--- a/drivers/usb/misc/yurex.c
+++ b/drivers/usb/misc/yurex.c
@@ -178,6 +178,10 @@ static void yurex_interrupt(struct urb *
 	}
 
 exit:
+	if (!usb_get_intfdata(dev->interface)) {
+		dev_info(&dev->interface->dev, "%s unbound\n", __func__);
+		return;
+	}
 	retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
 	if (retval) {
 		dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n",
@@ -309,11 +313,15 @@ static void yurex_disconnect(struct usb_
 
 	dev = usb_get_intfdata(interface);
 	usb_set_intfdata(interface, NULL);
+	dev_info(&interface->dev, "%s\n", __func__);
 
 	/* give back our minor */
 	usb_deregister_dev(interface, &yurex_class);
 
 	/* prevent more I/O from starting */
+	dev_info(&interface->dev, "Before poison\n");
+	usb_poison_urb(dev->urb);
+	dev_info(&interface->dev, "After poison\n");
 	mutex_lock(&dev->io_mutex);
 	dev->interface = NULL;
 	mutex_unlock(&dev->io_mutex);