linux-kernel - [PATCH 3.10 051/268] USB: cdc-acm: fix double usb_autopm_put_interface() in acm_port

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 19 Jun 2017 20:29:10 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Alexey Khoroshilov <khoroshilov@...ras.ru>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 051/268] USB: cdc-acm: fix double usb_autopm_put_interface() in acm_port_activate()

From: Alexey Khoroshilov <khoroshilov@...ras.ru>

commit 070c0b17f6a1ba39dff9be112218127e7e8fd456 upstream.

If acm_submit_read_urbs() fails in acm_port_activate(), error handling
code calls usb_autopm_put_interface() while it is already called
before acm_submit_read_urbs(). The patch reorganizes error handling code
to avoid double decrement of USB interface's PM-usage counter.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
Acked-by: Oliver Neukum <oliver@...kum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/usb/class/cdc-acm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index b364845..e16b9ef 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -546,13 +546,16 @@ static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
 	if (usb_submit_urb(acm->ctrlurb, GFP_KERNEL)) {
 		dev_err(&acm->control->dev,
 			"%s - usb_submit_urb(ctrl irq) failed\n", __func__);
+		usb_autopm_put_interface(acm->control);
 		goto error_submit_urb;
 	}
 
 	acm->ctrlout = ACM_CTRL_DTR | ACM_CTRL_RTS;
 	if (acm_set_control(acm, acm->ctrlout) < 0 &&
-	    (acm->ctrl_caps & USB_CDC_CAP_LINE))
+	    (acm->ctrl_caps & USB_CDC_CAP_LINE)) {
+		usb_autopm_put_interface(acm->control);
 		goto error_set_control;
+	}
 
 	usb_autopm_put_interface(acm->control);
 
@@ -579,7 +582,6 @@ error_submit_read_urbs:
 error_set_control:
 	usb_kill_urb(acm->ctrlurb);
 error_submit_urb:
-	usb_autopm_put_interface(acm->control);
 error_get_interface:
 disconnected:
 	mutex_unlock(&acm->mutex);
-- 
2.8.0.rc2.1.gbe9624a