linux-kernel - [PATCH 1/1] nfc: nfcmrvl: Fix memory leak in nfcmrvl_play

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Date:   Sun,  5 Jun 2022 16:14:55 +0800
From:   Xiaohui Zhang <ruc_zhangxiaohui@....com>
To:     Xiaohui Zhang <ruc_zhangxiaohui@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] nfc: nfcmrvl: Fix memory leak in nfcmrvl_play_deferred

From: xiaohuizhang98 <ruc_zhangxiaohui@....com>

We detected a suspected bug with our code clone detection tool.

Similar to the handling of play_deferred in commit 19cfe912c37b
("Bluetooth: btusb: Fix memory leak in play_deferred"), we thought
a patch might be needed here as well.

Currently usb_submit_urb is called directly to submit deferred tx
urbs after unanchor them.

So the usb_giveback_urb_bh would failed to unref it in usb_unanchor_urb
and cause memory leak.

Put those urbs in tx_anchor to avoid the leak, and also fix the error
handling.

Signed-off-by: xiaohuizhang98 <ruc_zhangxiaohui@....com>
---
 drivers/nfc/nfcmrvl/usb.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/nfc/nfcmrvl/usb.c b/drivers/nfc/nfcmrvl/usb.c
index a99aedff795d..ea7309453096 100644
--- a/drivers/nfc/nfcmrvl/usb.c
+++ b/drivers/nfc/nfcmrvl/usb.c
@@ -388,13 +388,25 @@ static void nfcmrvl_play_deferred(struct nfcmrvl_usb_drv_data *drv_data)
 	int err;
 
 	while ((urb = usb_get_from_anchor(&drv_data->deferred))) {
+		usb_anchor_urb(urb, &drv_data->tx_anchor);
+
 		err = usb_submit_urb(urb, GFP_ATOMIC);
-		if (err)
+		if (err) {
+			kfree(urb->setup_packet);
+			usb_unanchor_urb(urb);
+			usb_free_urb(urb);
 			break;
+		}
 
 		drv_data->tx_in_flight++;
+		usb_free_urb(urb);
+	}
+
+	/* Cleanup the rest deferred urbs. */
+	while ((urb = usb_get_from_anchor(&drv_data->deferred))) {
+		kfree(urb->setup_packet);
+		usb_free_urb(urb);
 	}
-	usb_scuttle_anchored_urbs(&drv_data->deferred);
 }
 
 static int nfcmrvl_resume(struct usb_interface *intf)
-- 
2.17.1