This is a note to let you know that I've just added the patch titled
USB: ch341: fix use-after-free in TIOCMIWAIT
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-ch341-fix-use-after-free-in-tiocmiwait.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d14eeaffa77b092812af5868f9bfed2c6502d786 Mon Sep 17 00:00:00 2001
From: Johan Hovold <jhovold@xxxxxxxxx>
Date: Tue, 19 Mar 2013 09:21:12 +0100
Subject: USB: ch341: fix use-after-free in TIOCMIWAIT
From: Johan Hovold <jhovold@xxxxxxxxx>
commit fa1e11d5231c001c80a479160b5832933c5d35fb upstream.
Use the port wait queue and make sure to check the serial disconnected
flag before accessing private port data after waking up.
This is is needed as the private port data (including the wait queue
itself) can be gone when waking up after a disconnect.
Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/serial/ch341.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
--- a/drivers/usb/serial/ch341.c
+++ b/drivers/usb/serial/ch341.c
@@ -82,7 +82,6 @@ MODULE_DEVICE_TABLE(usb, id_table);
struct ch341_private {
spinlock_t lock; /* access lock */
- wait_queue_head_t delta_msr_wait; /* wait queue for modem status */
unsigned baud_rate; /* set baud rate */
u8 line_control; /* set line control value RTS/DTR */
u8 line_status; /* active status of modem control inputs */
@@ -262,7 +261,6 @@ static int ch341_attach(struct usb_seria
return -ENOMEM;
spin_lock_init(&priv->lock);
- init_waitqueue_head(&priv->delta_msr_wait);
priv->baud_rate = DEFAULT_BAUD_RATE;
priv->line_control = CH341_BIT_RTS | CH341_BIT_DTR;
@@ -299,7 +297,7 @@ static void ch341_dtr_rts(struct usb_ser
priv->line_control &= ~(CH341_BIT_RTS | CH341_BIT_DTR);
spin_unlock_irqrestore(&priv->lock, flags);
ch341_set_handshake(port->serial->dev, priv->line_control);
- wake_up_interruptible(&priv->delta_msr_wait);
+ wake_up_interruptible(&port->delta_msr_wait);
}
static void ch341_close(struct usb_serial_port *port)
@@ -502,7 +500,7 @@ static void ch341_read_int_callback(stru
tty_kref_put(tty);
}
- wake_up_interruptible(&priv->delta_msr_wait);
+ wake_up_interruptible(&port->delta_msr_wait);
}
exit:
@@ -528,11 +526,14 @@ static int wait_modem_info(struct usb_se
spin_unlock_irqrestore(&priv->lock, flags);
while (!multi_change) {
- interruptible_sleep_on(&priv->delta_msr_wait);
+ interruptible_sleep_on(&port->delta_msr_wait);
/* see if a signal did it */
if (signal_pending(current))
return -ERESTARTSYS;
+ if (port->serial->disconnected)
+ return -EIO;
+
spin_lock_irqsave(&priv->lock, flags);
status = priv->line_status;
multi_change = priv->multi_status_change;
Patches currently in stable-queue which might be from jhovold@xxxxxxxxx are
queue-3.4/usb-oti6858-fix-use-after-free-in-tiocmiwait.patch
queue-3.4/usb-io_ti-fix-use-after-free-in-tiocmiwait.patch
queue-3.4/usb-ch341-fix-use-after-free-in-tiocmiwait.patch
queue-3.4/usb-io_edgeport-fix-use-after-free-in-tiocmiwait.patch
queue-3.4/usb-ftdi_sio-fix-use-after-free-in-tiocmiwait.patch
queue-3.4/usb-ark3116-fix-use-after-free-in-tiocmiwait.patch
queue-3.4/usb-pl2303-fix-use-after-free-in-tiocmiwait.patch
queue-3.4/usb-cypress_m8-fix-use-after-free-in-tiocmiwait.patch
queue-3.4/usb-ssu100-fix-use-after-free-in-tiocmiwait.patch
queue-3.4/usb-mct_u232-fix-use-after-free-in-tiocmiwait.patch
queue-3.4/usb-spcp8x5-fix-use-after-free-in-tiocmiwait.patch
queue-3.4/usb-ti_usb_3410_5052-fix-use-after-free-in-tiocmiwait.patch
queue-3.4/usb-mos7840-fix-broken-tiocmiwait.patch
queue-3.4/usb-serial-fix-hang-when-opening-port.patch
queue-3.4/usb-mos7840-fix-use-after-free-in-tiocmiwait.patch
queue-3.4/usb-serial-add-modem-status-change-wait-queue.patch
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