From: Johan Hovold johan@kernel.org
commit 80cd5479b525093a56ef768553045741af61b250 upstream.
The driver was accessing its struct usb_interface from its release() callback without holding a reference. This would lead to a use-after-free whenever debugging was enabled and the device was disconnected while its character device was open.
Fixes: 549e83500b80 ("USB: iowarrior: Convert local dbg macro to dev_dbg") Cc: stable stable@vger.kernel.org # 3.16 Signed-off-by: Johan Hovold johan@kernel.org Link: https://lore.kernel.org/r/20191009104846.5925-3-johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/misc/iowarrior.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/usb/misc/iowarrior.c +++ b/drivers/usb/misc/iowarrior.c @@ -246,6 +246,7 @@ static inline void iowarrior_delete(stru kfree(dev->int_in_buffer); usb_free_urb(dev->int_in_urb); kfree(dev->read_queue); + usb_put_intf(dev->interface); kfree(dev); }
@@ -768,7 +769,7 @@ static int iowarrior_probe(struct usb_in init_waitqueue_head(&dev->write_wait);
dev->udev = udev; - dev->interface = interface; + dev->interface = usb_get_intf(interface);
iface_desc = interface->cur_altsetting; dev->product_id = le16_to_cpu(udev->descriptor.idProduct);