[PATCH 1/2] USB: serial: console: fix use-after-free on disconnect

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* [PATCH 1/2] USB: serial: console: fix use-after-free on disconnect
       [not found] <20171004090113.24218-1-johan@kernel.org>
@ 2017-10-04  9:01 ` Johan Hovold
  2017-10-04 14:39   ` Greg KH
                     ` (2 more replies)
  2017-10-04  9:01 ` [PATCH 2/2] USB: serial: console: fix use-after-free after failed setup Johan Hovold
  1 sibling, 3 replies; 8+ messages in thread
From: Johan Hovold @ 2017-10-04  9:01 UTC (permalink / raw)
  To: linux-usb; +Cc: Andrey Konovalov, linux-kernel, Johan Hovold, stable

A clean-up patch removing 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: 0e517c93dc02 ("USB: serial: console: clean up sanity checks")
Cc: stable <stable@vger.kernel.org>     # 4.11
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/serial/console.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/serial/console.c b/drivers/usb/serial/console.c
index fdf89800ebc3..ed8ba3ef5c79 100644
--- a/drivers/usb/serial/console.c
+++ b/drivers/usb/serial/console.c
@@ -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);
 	}
-- 
2.14.2

^ permalink raw reply related	[flat|nested] 8+ messages in thread

* Re: [PATCH 1/2] USB: serial: console: fix use-after-free on disconnect
  2017-10-04  9:01 ` [PATCH 1/2] USB: serial: console: fix use-after-free on disconnect Johan Hovold
@ 2017-10-04 14:39   ` Greg KH
  2017-10-07  8:56   ` Jaejoong Kim
  2017-10-09 11:05   ` Andrey Konovalov
  2 siblings, 0 replies; 8+ messages in thread
From: Greg KH @ 2017-10-04 14:39 UTC (permalink / raw)
  To: Johan Hovold; +Cc: linux-usb, Andrey Konovalov, linux-kernel, stable

On Wed, Oct 04, 2017 at 11:01:12AM +0200, Johan Hovold wrote:
> A clean-up patch removing 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: 0e517c93dc02 ("USB: serial: console: clean up sanity checks")
> Cc: stable <stable@vger.kernel.org>     # 4.11
> Reported-by: Andrey Konovalov <andreyknvl@google.com>
> Signed-off-by: Johan Hovold <johan@kernel.org>

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH 1/2] USB: serial: console: fix use-after-free on disconnect
  2017-10-04  9:01 ` [PATCH 1/2] USB: serial: console: fix use-after-free on disconnect Johan Hovold
  2017-10-04 14:39   ` Greg KH
@ 2017-10-07  8:56   ` Jaejoong Kim
  2017-10-09 10:41     ` Johan Hovold
  2017-10-09 11:05   ` Andrey Konovalov
  2 siblings, 1 reply; 8+ messages in thread
From: Jaejoong Kim @ 2017-10-07  8:56 UTC (permalink / raw)
  To: Johan Hovold; +Cc: USB list, Andrey Konovalov, LKML, stable

Hi

2017-10-04 18:01 GMT+09:00 Johan Hovold <johan@kernel.org>:
> A clean-up patch removing removing two redundant NULL-checks from the
                               ^^^^^^^^^^^^^^^^^^
The word 'removing' was written twice. :)

> 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: 0e517c93dc02 ("USB: serial: console: clean up sanity checks")
> Cc: stable <stable@vger.kernel.org>     # 4.11
> Reported-by: Andrey Konovalov <andreyknvl@google.com>
> Signed-off-by: Johan Hovold <johan@kernel.org>
> ---
>  drivers/usb/serial/console.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/serial/console.c b/drivers/usb/serial/console.c
> index fdf89800ebc3..ed8ba3ef5c79 100644
> --- a/drivers/usb/serial/console.c
> +++ b/drivers/usb/serial/console.c
> @@ -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);
>         }
> --
> 2.14.2
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-usb" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH 1/2] USB: serial: console: fix use-after-free on disconnect
  2017-10-07  8:56   ` Jaejoong Kim
@ 2017-10-09 10:41     ` Johan Hovold
  0 siblings, 0 replies; 8+ messages in thread
From: Johan Hovold @ 2017-10-09 10:41 UTC (permalink / raw)
  To: Jaejoong Kim; +Cc: Johan Hovold, USB list, Andrey Konovalov, LKML, stable

On Sat, Oct 07, 2017 at 05:56:17PM +0900, Jaejoong Kim wrote:
> Hi
> 
> 2017-10-04 18:01 GMT+09:00 Johan Hovold <johan@kernel.org>:
> > A clean-up patch removing removing two redundant NULL-checks from the
>                                ^^^^^^^^^^^^^^^^^^
> The word 'removing' was written twice. :)

Thanks for noticing, now fixed up.

Johan

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH 1/2] USB: serial: console: fix use-after-free on disconnect
  2017-10-04  9:01 ` [PATCH 1/2] USB: serial: console: fix use-after-free on disconnect Johan Hovold
  2017-10-04 14:39   ` Greg KH
  2017-10-07  8:56   ` Jaejoong Kim
@ 2017-10-09 11:05   ` Andrey Konovalov
  2017-10-09 11:10     ` Johan Hovold
  2 siblings, 1 reply; 8+ messages in thread
From: Andrey Konovalov @ 2017-10-09 11:05 UTC (permalink / raw)
  To: Johan Hovold; +Cc: USB list, LKML, stable

On Wed, Oct 4, 2017 at 11:01 AM, Johan Hovold <johan@kernel.org> wrote:
> A clean-up patch removing 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: 0e517c93dc02 ("USB: serial: console: clean up sanity checks")
> Cc: stable <stable@vger.kernel.org>     # 4.11
> Reported-by: Andrey Konovalov <andreyknvl@google.com>

Tested-by: Andrey Konovalov <andreyknvl@google.com>

This fixes the crash.

Thanks!

> Signed-off-by: Johan Hovold <johan@kernel.org>
> ---
>  drivers/usb/serial/console.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/serial/console.c b/drivers/usb/serial/console.c
> index fdf89800ebc3..ed8ba3ef5c79 100644
> --- a/drivers/usb/serial/console.c
> +++ b/drivers/usb/serial/console.c
> @@ -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);
>         }
> --
> 2.14.2
>

^ permalink raw reply	[flat|nested] 8+ messages in thread

* Re: [PATCH 1/2] USB: serial: console: fix use-after-free on disconnect
  2017-10-09 11:05   ` Andrey Konovalov
@ 2017-10-09 11:10     ` Johan Hovold
  0 siblings, 0 replies; 8+ messages in thread
From: Johan Hovold @ 2017-10-09 11:10 UTC (permalink / raw)
  To: Andrey Konovalov; +Cc: Johan Hovold, USB list, LKML, stable

On Mon, Oct 09, 2017 at 01:05:30PM +0200, Andrey Konovalov wrote:
> On Wed, Oct 4, 2017 at 11:01 AM, Johan Hovold <johan@kernel.org> wrote:
> > A clean-up patch removing 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: 0e517c93dc02 ("USB: serial: console: clean up sanity checks")
> > Cc: stable <stable@vger.kernel.org>     # 4.11
> > Reported-by: Andrey Konovalov <andreyknvl@google.com>
> 
> Tested-by: Andrey Konovalov <andreyknvl@google.com>
> 
> This fixes the crash.

I just forwarded this one in a pull-request to Greg, but thanks for
testing nonetheless.

Johan

^ permalink raw reply	[flat|nested] 8+ messages in thread

* [PATCH 2/2] USB: serial: console: fix use-after-free after failed setup
       [not found] <20171004090113.24218-1-johan@kernel.org>
  2017-10-04  9:01 ` [PATCH 1/2] USB: serial: console: fix use-after-free on disconnect Johan Hovold
@ 2017-10-04  9:01 ` Johan Hovold
  2017-10-04 14:39   ` Greg KH
  1 sibling, 1 reply; 8+ messages in thread
From: Johan Hovold @ 2017-10-04  9:01 UTC (permalink / raw)
  To: linux-usb; +Cc: Andrey Konovalov, linux-kernel, Johan Hovold, stable

Make sure to reset the USB-console port pointer when console setup fails
in order to avoid having the struct usb_serial be prematurely freed by
the console code when the device is later disconnected.

Fixes: 73e487fdb75f ("[PATCH] USB console: fix disconnection issues")
Cc: stable <stable@vger.kernel.org>	# 2.6.18
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/serial/console.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/serial/console.c b/drivers/usb/serial/console.c
index ed8ba3ef5c79..43a862a90a77 100644
--- a/drivers/usb/serial/console.c
+++ b/drivers/usb/serial/console.c
@@ -186,6 +186,7 @@ static int usb_console_setup(struct console *co, char *options)
 	tty_kref_put(tty);
  reset_open_count:
 	port->port.count = 0;
+	info->port = NULL;
 	usb_autopm_put_interface(serial->interface);
  error_get_interface:
 	usb_serial_put(serial);
-- 
2.14.2

^ permalink raw reply related	[flat|nested] 8+ messages in thread

* Re: [PATCH 2/2] USB: serial: console: fix use-after-free after failed setup
  2017-10-04  9:01 ` [PATCH 2/2] USB: serial: console: fix use-after-free after failed setup Johan Hovold
@ 2017-10-04 14:39   ` Greg KH
  0 siblings, 0 replies; 8+ messages in thread
From: Greg KH @ 2017-10-04 14:39 UTC (permalink / raw)
  To: Johan Hovold; +Cc: linux-usb, Andrey Konovalov, linux-kernel, stable

On Wed, Oct 04, 2017 at 11:01:13AM +0200, Johan Hovold wrote:
> Make sure to reset the USB-console port pointer when console setup fails
> in order to avoid having the struct usb_serial be prematurely freed by
> the console code when the device is later disconnected.
> 
> Fixes: 73e487fdb75f ("[PATCH] USB console: fix disconnection issues")
> Cc: stable <stable@vger.kernel.org>	# 2.6.18
> Signed-off-by: Johan Hovold <johan@kernel.org>

Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

^ permalink raw reply	[flat|nested] 8+ messages in thread

end of thread, other threads:[~2017-10-09 11:10 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
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     [not found] <20171004090113.24218-1-johan@kernel.org>
2017-10-04  9:01 ` [PATCH 1/2] USB: serial: console: fix use-after-free on disconnect Johan Hovold
2017-10-04 14:39   ` Greg KH
2017-10-07  8:56   ` Jaejoong Kim
2017-10-09 10:41     ` Johan Hovold
2017-10-09 11:05   ` Andrey Konovalov
2017-10-09 11:10     ` Johan Hovold
2017-10-04  9:01 ` [PATCH 2/2] USB: serial: console: fix use-after-free after failed setup Johan Hovold
2017-10-04 14:39   ` Greg KH

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