Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161079Ab3DKVOf (ORCPT ); Thu, 11 Apr 2013 17:14:35 -0400 Received: from hrndva-omtalb.mail.rr.com ([71.74.56.122]:10296 "EHLO hrndva-omtalb.mail.rr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S935285Ab3DKUtB (ORCPT ); Thu, 11 Apr 2013 16:49:01 -0400 X-Authority-Analysis: v=2.0 cv=F+XVh9dN c=1 sm=0 a=rXTBtCOcEpjy1lPqhTCpEQ==:17 a=mNMOxpOpBa8A:10 a=Ciwy3NGCPMMA:10 a=hR3n3DlAe28A:10 a=5SG0PmZfjMsA:10 a=bbbx4UPp9XUA:10 a=meVymXHHAAAA:8 a=jLr3qM_lNTkA:10 a=pGLkceISAAAA:8 a=VwQbUJbxAAAA:8 a=ag1SF4gXAAAA:8 a=i5l3BeYsPBN1KbzBBJEA:9 a=MSl-tDqOz04A:10 a=1TSTQ8KKaH4A:10 a=jeBq3FmKZ4MA:10 a=lJZ25d0EtmPCNKnz:21 a=2pvLEvEE8YnsrPsF:21 a=rXTBtCOcEpjy1lPqhTCpEQ==:117 X-Cloudmark-Score: 0 X-Authenticated-User: X-Originating-IP: 74.67.115.198 Message-Id: <20130411202608.131942887@goodmis.org> User-Agent: quilt/0.60-1 Date: Thu, 11 Apr 2013 16:27:16 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Johan Hovold , Greg Kroah-Hartman Subject: [ 133/171 ] USB: ti_usb_3410_5052: fix use-after-free in TIOCMIWAIT References: <20130411202503.783159048@goodmis.org> Content-Disposition: inline; filename=0133-USB-ti_usb_3410_5052-fix-use-after-free-in-TIOCMIWAI.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2715 Lines: 76 3.6.11.2 stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold [ Upstream commit fc98ab873aa3dbe783ce56a2ffdbbe7c7609521a ] 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. Cc: stable Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman Signed-off-by: Steven Rostedt --- drivers/usb/serial/ti_usb_3410_5052.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c index 33537bb..722069c 100644 --- a/drivers/usb/serial/ti_usb_3410_5052.c +++ b/drivers/usb/serial/ti_usb_3410_5052.c @@ -75,7 +75,6 @@ struct ti_port { int tp_flags; int tp_closing_wait;/* in .01 secs */ struct async_icount tp_icount; - wait_queue_head_t tp_msr_wait; /* wait for msr change */ wait_queue_head_t tp_write_wait; struct ti_device *tp_tdev; struct usb_serial_port *tp_port; @@ -442,7 +441,6 @@ static int ti_port_probe(struct usb_serial_port *port) else tport->tp_uart_base_addr = TI_UART2_BASE_ADDR; tport->tp_closing_wait = closing_wait; - init_waitqueue_head(&tport->tp_msr_wait); init_waitqueue_head(&tport->tp_write_wait); if (kfifo_alloc(&tport->write_fifo, TI_WRITE_BUF_SIZE, GFP_KERNEL)) { kfree(tport); @@ -798,9 +796,13 @@ static int ti_ioctl(struct tty_struct *tty, dbg("%s - (%d) TIOCMIWAIT", __func__, port->number); cprev = tport->tp_icount; while (1) { - interruptible_sleep_on(&tport->tp_msr_wait); + interruptible_sleep_on(&port->delta_msr_wait); if (signal_pending(current)) return -ERESTARTSYS; + + if (port->serial->disconnected) + return -EIO; + cnow = tport->tp_icount; if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && cnow.dcd == cprev.dcd && cnow.cts == cprev.cts) @@ -1412,7 +1414,7 @@ static void ti_handle_new_msr(struct ti_port *tport, __u8 msr) icount->dcd++; if (msr & TI_MSR_DELTA_RI) icount->rng++; - wake_up_interruptible(&tport->tp_msr_wait); + wake_up_interruptible(&tport->tp_port->delta_msr_wait); spin_unlock_irqrestore(&tport->tp_lock, flags); } -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/