From: Peilin Ye peilin.ye@bytedance.com
[ Upstream commit a43206156263fbaf1f2b7f96257441f331e91bb7 ]
Currently usbnet_disconnect() unanchors and frees all deferred URBs using usb_scuttle_anchored_urbs(), which does not free urb->context, causing a memory leak as reported by syzbot.
Use a usb_get_from_anchor() while loop instead, similar to what we did in commit 19cfe912c37b ("Bluetooth: btusb: Fix memory leak in play_deferred"). Also free urb->sg.
Reported-and-tested-by: syzbot+dcd3e13cf4472f2e0ba1@syzkaller.appspotmail.com Fixes: 69ee472f2706 ("usbnet & cdc-ether: Autosuspend for online devices") Fixes: 638c5115a794 ("USBNET: support DMA SG") Signed-off-by: Peilin Ye peilin.ye@bytedance.com Link: https://lore.kernel.org/r/20220923042551.2745-1-yepeilin.cs@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/usb/usbnet.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 7a8324d2a968..7af8c3a8f3f1 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -1585,6 +1585,7 @@ void usbnet_disconnect (struct usb_interface *intf) struct usbnet *dev; struct usb_device *xdev; struct net_device *net; + struct urb *urb;
dev = usb_get_intfdata(intf); usb_set_intfdata(intf, NULL); @@ -1601,7 +1602,11 @@ void usbnet_disconnect (struct usb_interface *intf) net = dev->net; unregister_netdev (net);
- usb_scuttle_anchored_urbs(&dev->deferred); + while ((urb = usb_get_from_anchor(&dev->deferred))) { + dev_kfree_skb(urb->context); + kfree(urb->sg); + usb_free_urb(urb); + }
if (dev->driver_info->unbind) dev->driver_info->unbind (dev, intf);