From 35be1a71d70775e7bd7e45fa6d2897342ff4c9d2 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Sun, 8 May 2016 20:07:58 +0200 Subject: [PATCH] USB: serial: keyspan: fix use-after-free in probe error path The interface instat and indat URBs were submitted in attach, but never unlinked in release before deallocating the corresponding transfer buffers. In the case of a late probe error (e.g. due to failed minor allocation), disconnect would not have been called before release, causing the buffers to be freed while the URBs are still in use. We'd also end up with active URBs for an unbound interface. Fixes: f9c99bb8b3a1 ("USB: usb-serial: replace shutdown with disconnect, release") Cc: stable # v2.6.31 Signed-off-by: Johan Hovold Acked-by: Greg Kroah-Hartman --- drivers/usb/serial/keyspan.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c index b6bd8e4..1cf0588 100644 --- a/drivers/usb/serial/keyspan.c +++ b/drivers/usb/serial/keyspan.c @@ -2376,6 +2376,10 @@ static void keyspan_release(struct usb_serial *serial) s_priv = usb_get_serial_data(serial); + /* Make sure to unlink the URBs submitted in attach. */ + usb_kill_urb(s_priv->instat_urb); + usb_kill_urb(s_priv->indat_urb); + usb_free_urb(s_priv->instat_urb); usb_free_urb(s_priv->indat_urb); usb_free_urb(s_priv->glocont_urb); -- 2.7.4