This is a note to let you know that I've just added the patch titled
USB: io_ti: 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-io_ti-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 24d369d8ad2aea254f5685f6565bf31175a1c617 Mon Sep 17 00:00:00 2001
From: Johan Hovold <jhovold@xxxxxxxxx>
Date: Tue, 19 Mar 2013 09:21:17 +0100
Subject: USB: io_ti: fix use-after-free in TIOCMIWAIT
From: Johan Hovold <jhovold@xxxxxxxxx>
commit 7b2459690584f239650a365f3411ba2ec1c6d1e0 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/io_ti.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
--- a/drivers/usb/serial/io_ti.c
+++ b/drivers/usb/serial/io_ti.c
@@ -91,9 +91,6 @@ struct edgeport_port {
int close_pending;
int lsr_event;
struct async_icount icount;
- wait_queue_head_t delta_msr_wait; /* for handling sleeping while
- waiting for msr change to
- happen */
struct edgeport_serial *edge_serial;
struct usb_serial_port *port;
__u8 bUartMode; /* Port type, 0: RS232, etc. */
@@ -1549,7 +1546,7 @@ static void handle_new_msr(struct edgepo
icount->dcd++;
if (msr & EDGEPORT_MSR_DELTA_RI)
icount->rng++;
- wake_up_interruptible(&edge_port->delta_msr_wait);
+ wake_up_interruptible(&edge_port->port->delta_msr_wait);
}
/* Save the new modem status */
@@ -1867,7 +1864,6 @@ static int edge_open(struct tty_struct *
dev = port->serial->dev;
memset(&(edge_port->icount), 0x00, sizeof(edge_port->icount));
- init_waitqueue_head(&edge_port->delta_msr_wait);
/* turn off loopback */
status = ti_do_config(edge_port, UMPC_SET_CLR_LOOPBACK, 0);
@@ -2553,10 +2549,14 @@ static int edge_ioctl(struct tty_struct
dbg("%s - (%d) TIOCMIWAIT", __func__, port->number);
cprev = edge_port->icount;
while (1) {
- interruptible_sleep_on(&edge_port->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;
+
cnow = edge_port->icount;
if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
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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