3.16.80-rc1 review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan@kernel.org
commit b5f8d46867ca233d773408ffbe691a8062ed718f upstream.
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.") 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 [bwh: Backported to 3.16: adjust context] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- drivers/usb/misc/iowarrior.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/usb/misc/iowarrior.c +++ b/drivers/usb/misc/iowarrior.c @@ -89,6 +89,7 @@ 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; };
/*--------------*/ @@ -437,11 +438,13 @@ static ssize_t iowarrior_write(struct fi 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 */ @@ -788,6 +791,8 @@ static int iowarrior_probe(struct usb_in iface_desc = interface->cur_altsetting; dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
+ init_usb_anchor(&dev->submitted); + /* set up the endpoint information */ for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { endpoint = &iface_desc->endpoint[i].desc; @@ -917,6 +922,7 @@ static void iowarrior_disconnect(struct 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);