drivers: net: fix memory leak in atusb_probe

commit 6b9fbe16955152626557ec6f439f3407b7769941 upstream.

syzbot reported memory leak in atusb_probe()[1].
The problem was in atusb_alloc_urbs().
Since urb is anchored, we need to release the reference
to correctly free the urb

backtrace:
    [<ffffffff82ba0466>] kmalloc include/linux/slab.h:559 [inline]
    [<ffffffff82ba0466>] usb_alloc_urb+0x66/0xe0 drivers/usb/core/urb.c:74
    [<ffffffff82ad3888>] atusb_alloc_urbs drivers/net/ieee802154/atusb.c:362 [inline][2]
    [<ffffffff82ad3888>] atusb_probe+0x158/0x820 drivers/net/ieee802154/atusb.c:1038 [1]

Reported-by: syzbot+28a246747e0a465127f3@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ieee802154/atusb.c b/drivers/net/ieee802154/atusb.c
index 12df6cfb423ace7a1bb81a145c11f98e8f60620a..0ee54fba0a237d12941382c4f340ecd44f7ef79a 100644 (file)
--- a/drivers/net/ieee802154/atusb.c
+++ b/drivers/net/ieee802154/atusb.c
@@ -341,6 +341,7 @@ static int atusb_alloc_urbs(struct atusb *atusb, int n)
                        return -ENOMEM;
                }
                usb_anchor_urb(urb, &atusb->idle_urbs);
+               usb_free_urb(urb);
                n--;
        }
        return 0;