netdev - [PATCH 2/4] USB: wdm: close race between wdm_open and wdm_wwan_port

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Message-ID: <20250331132614.51902-3-oneukum@suse.com>
Date: Mon, 31 Mar 2025 15:25:02 +0200
From: Oliver Neukum <oneukum@...e.com>
To: gregkh@...uxfoundation.org,
	bjorn@...k.no,
	loic.poulain@...aro.org,
	linux-usb@...r.kernel.org,
	netdev@...r.kernel.org
Cc: Oliver Neukum <oneukum@...e.com>
Subject: [PATCH 2/4] USB: wdm: close race between wdm_open and wdm_wwan_port_stop

Clearing WDM_WWAN_IN_USE must be the last action or
we can open a chardev whose URBs are still poisoned

Fixes: cac6fb015f71 ("usb: class: cdc-wdm: WWAN framework integration")
Signed-off-by: Oliver Neukum <oneukum@...e.com>
---
 drivers/usb/class/cdc-wdm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 12038aa43942..e67844618da6 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -870,8 +870,9 @@ static void wdm_wwan_port_stop(struct wwan_port *port)
 	poison_urbs(desc);
 	desc->manage_power(desc->intf, 0);
 	clear_bit(WDM_READ, &desc->flags);
-	clear_bit(WDM_WWAN_IN_USE, &desc->flags);
 	unpoison_urbs(desc);
+	/* this must be last lest we open a poisoned device */
+	clear_bit(WDM_WWAN_IN_USE, &desc->flags);
 }
 
 static void wdm_wwan_port_tx_complete(struct urb *urb)
-- 
2.49.0