linux-kernel - [PATCH v2] staging: rtl8712: Fix memory leak in r8712_init_recv

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Date:   Sat, 22 May 2021 00:25:19 +0800
From:   Dongliang Mu <mudongliangabcd@...il.com>
To:     Larry.Finger@...inger.net, florian.c.schilhabel@...glemail.com,
        gregkh@...uxfoundation.org, rkovhaev@...il.com,
        straube.linux@...il.com, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Cc:     Dongliang Mu <mudongliangabcd@...il.com>,
        syzbot+1c46f3771695bccbdb3a@...kaller.appspotmail.com
Subject: [PATCH v2] staging: rtl8712: Fix memory leak in r8712_init_recv_priv

r871xu_dev_remove failed to call r8712_free_drv_sw() and free the
resource (e.g., struct urb) due to the failure of firmware loading.

Fix this by invoking r8712_free_drv_sw at the failure site.

Reported-by: syzbot+1c46f3771695bccbdb3a@...kaller.appspotmail.com
Fixes: b4383c971bc5 ("staging: rtl8712: handle firmware load failure")
Signed-off-by: Dongliang Mu <mudongliangabcd@...il.com>
---
v1->v2: fix the initialization of pnetdev

 drivers/staging/rtl8712/usb_intf.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/rtl8712/usb_intf.c b/drivers/staging/rtl8712/usb_intf.c
index dc21e7743349..57e773464e18 100644
--- a/drivers/staging/rtl8712/usb_intf.c
+++ b/drivers/staging/rtl8712/usb_intf.c
@@ -593,13 +593,14 @@ static void r871xu_dev_remove(struct usb_interface *pusb_intf)
 	struct usb_device *udev = interface_to_usbdev(pusb_intf);
 
 	if (pnetdev) {
+		struct net_device *newpnetdev = NULL;
 		struct _adapter *padapter = netdev_priv(pnetdev);
 
 		/* never exit with a firmware callback pending */
 		wait_for_completion(&padapter->rtl8712_fw_ready);
-		pnetdev = usb_get_intfdata(pusb_intf);
+		newpnetdev = usb_get_intfdata(pusb_intf);
 		usb_set_intfdata(pusb_intf, NULL);
-		if (!pnetdev)
+		if (!newpnetdev)
 			goto firmware_load_fail;
 		release_firmware(padapter->fw);
 		if (drvpriv.drv_registered)
@@ -625,6 +626,10 @@ static void r871xu_dev_remove(struct usb_interface *pusb_intf)
 	 */
 	if (udev->state != USB_STATE_NOTATTACHED)
 		usb_reset_device(udev);
+	if (pnetdev) {
+		struct _adapter *padapter = netdev_priv(pnetdev);
+		r8712_free_drv_sw(padapter);
+	}
 }
 
 static int __init r8712u_drv_entry(void)
-- 
2.25.1