linux-kernel - [PATCH 3.16 39/83] usb: cdc-acm: make sure a refcount is taken early enough

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Date:   Wed, 20 Nov 2019 15:37:49 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Oliver Neukum" <oneukum@...e.com>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>
Subject: [PATCH 3.16 39/83] usb: cdc-acm: make sure a refcount is taken
 early enough

3.16.78-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Oliver Neukum <oneukum@...e.com>

commit c52873e5a1ef72f845526d9f6a50704433f9c625 upstream.

destroy() will decrement the refcount on the interface, so that
it needs to be taken so early that it never undercounts.

Fixes: 7fb57a019f94e ("USB: cdc-acm: Fix potential deadlock (lockdep warning)")
Reported-and-tested-by: syzbot+1b2449b7b5dc240d107a@...kaller.appspotmail.com
Signed-off-by: Oliver Neukum <oneukum@...e.com>
Link: https://lore.kernel.org/r/20190808142119.7998-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/class/cdc-acm.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1371,13 +1371,6 @@ made_compressed_probe:
 		goto alloc_fail;
 	}
 
-	minor = acm_alloc_minor(acm);
-	if (minor == ACM_TTY_MINORS) {
-		dev_err(&intf->dev, "no more free acm devices\n");
-		kfree(acm);
-		return -ENODEV;
-	}
-
 	ctrlsize = usb_endpoint_maxp(epctrl);
 	readsize = usb_endpoint_maxp(epread) *
 				(quirks == SINGLE_RX_URB ? 1 : 2);
@@ -1385,6 +1378,16 @@ made_compressed_probe:
 	acm->writesize = usb_endpoint_maxp(epwrite) * 20;
 	acm->control = control_interface;
 	acm->data = data_interface;
+
+	usb_get_intf(acm->control); /* undone in destruct() */
+
+	minor = acm_alloc_minor(acm);
+	if (minor < 0) {
+		dev_err(&intf->dev, "no more free acm devices\n");
+		kfree(acm);
+		return -ENODEV;
+	}
+
 	acm->minor = minor;
 	acm->dev = usb_dev;
 	acm->ctrl_caps = ac_management_function;
@@ -1540,7 +1543,6 @@ skip_countries:
 	usb_driver_claim_interface(&acm_driver, data_interface, acm);
 	usb_set_intfdata(data_interface, acm);
 
-	usb_get_intf(control_interface);
 	tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
 			&control_interface->dev);
 	if (IS_ERR(tty_dev)) {