This is a note to let you know that I've just added the patch titled
USB: iowarrior: fix use-after-free on release
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 80cd5479b525093a56ef768553045741af61b250 Mon Sep 17 00:00:00 2001
From: Johan Hovold johan@kernel.org Date: Wed, 9 Oct 2019 12:48:42 +0200 Subject: USB: iowarrior: fix use-after-free on release
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(-)
diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c index 4fe1d3267b3c..6841267820c6 100644 --- a/drivers/usb/misc/iowarrior.c +++ b/drivers/usb/misc/iowarrior.c @@ -243,6 +243,7 @@ static inline void iowarrior_delete(struct iowarrior *dev) kfree(dev->int_in_buffer); usb_free_urb(dev->int_in_urb); kfree(dev->read_queue); + usb_put_intf(dev->interface); kfree(dev); }
@@ -764,7 +765,7 @@ static int iowarrior_probe(struct usb_interface *interface, 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);