* [PATCH] USB: serial: mct_u232: fix missing interrupt-in transfer sanity check
@ 2026-05-20 10:17 Johan Hovold
2026-05-20 11:16 ` Greg Kroah-Hartman
0 siblings, 1 reply; 2+ messages in thread
From: Johan Hovold @ 2026-05-20 10:17 UTC (permalink / raw)
To: Johan Hovold; +Cc: Greg Kroah-Hartman, linux-usb, linux-kernel, stable
Add the missing sanity check on the size of interrupt-in transfers to
avoid parsing stale or uninitialised slab data (and leaking it to user
space).
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/usb/serial/mct_u232.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index ca1530da6e77..163161881d2d 100644
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -544,6 +544,11 @@ static void mct_u232_read_int_callback(struct urb *urb)
goto exit;
}
+ if (urb->actual_length < 2) {
+ dev_warn_ratelimited(&port->dev, "short interrupt-in packet\n");
+ goto exit;
+ }
+
/*
* The interrupt-in pipe signals exceptional conditions (modem line
* signal changes and errors). data[0] holds MSR, data[1] holds LSR.
--
2.53.0
^ permalink raw reply related [flat|nested] 2+ messages in thread* Re: [PATCH] USB: serial: mct_u232: fix missing interrupt-in transfer sanity check
2026-05-20 10:17 [PATCH] USB: serial: mct_u232: fix missing interrupt-in transfer sanity check Johan Hovold
@ 2026-05-20 11:16 ` Greg Kroah-Hartman
0 siblings, 0 replies; 2+ messages in thread
From: Greg Kroah-Hartman @ 2026-05-20 11:16 UTC (permalink / raw)
To: Johan Hovold; +Cc: linux-usb, linux-kernel, stable
On Wed, May 20, 2026 at 12:17:50PM +0200, Johan Hovold wrote:
> Add the missing sanity check on the size of interrupt-in transfers to
> avoid parsing stale or uninitialised slab data (and leaking it to user
> space).
>
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Cc: stable@vger.kernel.org
> Signed-off-by: Johan Hovold <johan@kernel.org>
> ---
> drivers/usb/serial/mct_u232.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
> index ca1530da6e77..163161881d2d 100644
> --- a/drivers/usb/serial/mct_u232.c
> +++ b/drivers/usb/serial/mct_u232.c
> @@ -544,6 +544,11 @@ static void mct_u232_read_int_callback(struct urb *urb)
> goto exit;
> }
>
> + if (urb->actual_length < 2) {
> + dev_warn_ratelimited(&port->dev, "short interrupt-in packet\n");
> + goto exit;
> + }
> +
> /*
> * The interrupt-in pipe signals exceptional conditions (modem line
> * signal changes and errors). data[0] holds MSR, data[1] holds LSR.
> --
> 2.53.0
>
>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
^ permalink raw reply [flat|nested] 2+ messages in thread
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2026-05-20 10:17 [PATCH] USB: serial: mct_u232: fix missing interrupt-in transfer sanity check Johan Hovold
2026-05-20 11:16 ` Greg Kroah-Hartman
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