[PATCH 4.4 46/79] USB: chaoskey: fix use-after-free on release

[Greg Kroah-Hartman]

From: Johan Hovold <jo...@kernel.org>

commit 93ddb1f56ae102f14f9e46a9a9c8017faa970003 upstream.

The driver was accessing its struct usb_interface in its release()
callback without holding a reference. This would lead to a
use-after-free whenever the device was disconnected while the character
device was still open.

Fixes: 66e3e591891d ("usb: Add driver for Altus Metrum ChaosKey device (v2)")
Cc: stable <sta...@vger.kernel.org>     # 4.1
Signed-off-by: Johan Hovold <jo...@kernel.org>
Link: https://lore.kernel.org/r/20191009153848.8664-3-jo...@kernel.org
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/usb/misc/chaoskey.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/usb/misc/chaoskey.c
+++ b/drivers/usb/misc/chaoskey.c
@@ -96,6 +96,7 @@ static void chaoskey_free(struct chaoske
        usb_dbg(dev->interface, "free");
        kfree(dev->name);
        kfree(dev->buf);
+       usb_put_intf(dev->interface);
        kfree(dev);
 }
 
@@ -144,6 +145,8 @@ static int chaoskey_probe(struct usb_int
        if (dev == NULL)
                return -ENOMEM;
 
+       dev->interface = usb_get_intf(interface);
+
        dev->buf = kmalloc(size, GFP_KERNEL);
 
        if (dev->buf == NULL) {
@@ -169,8 +172,6 @@ static int chaoskey_probe(struct usb_int
                strcat(dev->name, udev->serial);
        }
 
-       dev->interface = interface;
-
        dev->in_ep = in_ep;
 
        dev->size = size;