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USB: serial: console: fix use-after-free on disconnect 

A clean-up patch removing two redundant NULL-checks from the console
disconnect handler inadvertently also removed a third check. This could
lead to the struct usb_serial being prematurely freed by the console
code when a driver accepts but does not register any ports for an
interface which also lacks endpoint descriptors.

Fixes: 0e517c93dc ("USB: serial: console: clean up sanity checks")
Cc: stable <stable@vger.kernel.org>     # 4.11
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Johan Hovold 2017-10-04 11:01:12 +02:00
parent f5d9644c5f
commit bd998c2e0d
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/serial/console.c
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@ -265,7 +265,7 @@ static struct console usbcons = {
void usb_serial_console_disconnect(struct usb_serial *serial)
{
if (serial->port[0] == usbcons_info.port) {
if (serial->port[0] && serial->port[0] == usbcons_info.port) {
usb_serial_console_exit();
usb_serial_put(serial);
}