This is a note to let you know that I've just added the patch titled
USB: iowarrior: fix use-after-free after driver unbind
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 b5f8d46867ca233d773408ffbe691a8062ed718f Mon Sep 17 00:00:00 2001
From: Johan Hovold johan@kernel.org Date: Wed, 9 Oct 2019 12:48:43 +0200 Subject: USB: iowarrior: fix use-after-free after driver unbind
Make sure to stop also the asynchronous write URBs on disconnect() to avoid use-after-free in the completion handler after driver unbind.
Fixes: 946b960d13c1 ("USB: add driver for iowarrior devices.") Cc: stable stable@vger.kernel.org # 2.6.21: 51a2f077c44e ("USB: introduce usb_anchor") Signed-off-by: Johan Hovold johan@kernel.org Link: https://lore.kernel.org/r/20191009104846.5925-4-johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/misc/iowarrior.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c index 6841267820c6..f405fa734bcc 100644 --- a/drivers/usb/misc/iowarrior.c +++ b/drivers/usb/misc/iowarrior.c @@ -87,6 +87,7 @@ struct iowarrior { char chip_serial[9]; /* the serial number string of the chip connected */ int report_size; /* number of bytes in a report */ u16 product_id; + struct usb_anchor submitted; };
/*--------------*/ @@ -425,11 +426,13 @@ static ssize_t iowarrior_write(struct file *file, retval = -EFAULT; goto error; } + usb_anchor_urb(int_out_urb, &dev->submitted); retval = usb_submit_urb(int_out_urb, GFP_KERNEL); if (retval) { dev_dbg(&dev->interface->dev, "submit error %d for urb nr.%d\n", retval, atomic_read(&dev->write_busy)); + usb_unanchor_urb(int_out_urb); goto error; } /* submit was ok */ @@ -770,6 +773,8 @@ static int iowarrior_probe(struct usb_interface *interface, iface_desc = interface->cur_altsetting; dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
+ init_usb_anchor(&dev->submitted); + res = usb_find_last_int_in_endpoint(iface_desc, &dev->int_in_endpoint); if (res) { dev_err(&interface->dev, "no interrupt-in endpoint found\n"); @@ -885,6 +890,7 @@ static void iowarrior_disconnect(struct usb_interface *interface) Deleting the device is postponed until close() was called. */ usb_kill_urb(dev->int_in_urb); + usb_kill_anchored_urbs(&dev->submitted); wake_up_interruptible(&dev->read_wait); wake_up_interruptible(&dev->write_wait); mutex_unlock(&dev->mutex);