From: Johan Hovold Date: Sun, 8 May 2016 18:07:58 +0000 (+0200) Subject: USB: serial: keyspan: fix use-after-free in probe error path X-Git-Tag: firefly_0821_release~176^2~4^2~43^2~43 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=00efa6c22dd1fbbdaf1239c95ee615180512a736;p=firefly-linux-kernel-4.4.55.git USB: serial: keyspan: fix use-after-free in probe error path commit 35be1a71d70775e7bd7e45fa6d2897342ff4c9d2 upstream. 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") Signed-off-by: Johan Hovold Acked-by: Greg Kroah-Hartman Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/serial/keyspan.c b/drivers/usb/serial/keyspan.c index e07b15ed5814..7faa901ee47f 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);