linux-kernel - [PATCH 3.16 49/99] usb: gadget: f_ncm: Use atomic

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Date:   Wed, 20 May 2020 15:14:17 +0100
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>,
        "Felipe Balbi" <balbi@...nel.org>,
        "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
        "Bryan O'Donoghue" <bryan.odonoghue@...aro.org>
Subject: [PATCH 3.16 49/99] usb: gadget: f_ncm: Use atomic_t to track
 in-flight request

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

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

From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>

commit 5b24c28cfe136597dc3913e1c00b119307a20c7e upstream.

Currently ncm->notify_req is used to flag when a request is in-flight.
ncm->notify_req is set to NULL and when a request completes it is
subsequently reset.

This is fundamentally buggy in that the unbind logic of the NCM driver will
unconditionally free ncm->notify_req leading to a NULL pointer dereference.

Fixes: 40d133d7f542 ("usb: gadget: f_ncm: convert to new function interface with backward compatibility")
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Signed-off-by: Felipe Balbi <balbi@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
[bwh: Backported to 3.16: adjust filename]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/gadget/f_ncm.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

--- a/drivers/usb/gadget/f_ncm.c
+++ b/drivers/usb/gadget/f_ncm.c
@@ -57,6 +57,7 @@ struct f_ncm {
 	struct usb_ep			*notify;
 	struct usb_request		*notify_req;
 	u8				notify_state;
+	atomic_t			notify_count;
 	bool				is_open;
 
 	const struct ndp_parser_opts	*parser_opts;
@@ -460,7 +461,7 @@ static void ncm_do_notify(struct f_ncm *
 	int				status;
 
 	/* notification already in flight? */
-	if (!req)
+	if (atomic_read(&ncm->notify_count))
 		return;
 
 	event = req->buf;
@@ -500,7 +501,8 @@ static void ncm_do_notify(struct f_ncm *
 	event->bmRequestType = 0xA1;
 	event->wIndex = cpu_to_le16(ncm->ctrl_id);
 
-	ncm->notify_req = NULL;
+	atomic_inc(&ncm->notify_count);
+
 	/*
 	 * In double buffering if there is a space in FIFO,
 	 * completion callback can be called right after the call,
@@ -510,7 +512,7 @@ static void ncm_do_notify(struct f_ncm *
 	status = usb_ep_queue(ncm->notify, req, GFP_ATOMIC);
 	spin_lock(&ncm->lock);
 	if (status < 0) {
-		ncm->notify_req = req;
+		atomic_dec(&ncm->notify_count);
 		DBG(cdev, "notify --> %d\n", status);
 	}
 }
@@ -545,17 +547,19 @@ static void ncm_notify_complete(struct u
 	case 0:
 		VDBG(cdev, "Notification %02x sent\n",
 		     event->bNotificationType);
+		atomic_dec(&ncm->notify_count);
 		break;
 	case -ECONNRESET:
 	case -ESHUTDOWN:
+		atomic_set(&ncm->notify_count, 0);
 		ncm->notify_state = NCM_NOTIFY_NONE;
 		break;
 	default:
 		DBG(cdev, "event %02x --> %d\n",
 			event->bNotificationType, req->status);
+		atomic_dec(&ncm->notify_count);
 		break;
 	}
-	ncm->notify_req = req;
 	ncm_do_notify(ncm);
 	spin_unlock(&ncm->lock);
 }
@@ -1382,6 +1386,11 @@ static void ncm_unbind(struct usb_config
 
 	usb_free_all_descriptors(f);
 
+	if (atomic_read(&ncm->notify_count)) {
+		usb_ep_dequeue(ncm->notify, ncm->notify_req);
+		atomic_set(&ncm->notify_count, 0);
+	}
+
 	kfree(ncm->notify_req->buf);
 	usb_ep_free_request(ncm->notify, ncm->notify_req);
 }