wifi: ath9k: hif_usb: fix memory leak of urbs in ath9k_hif_usb_dealloc_tx_urbs()

[ Upstream commit c2a94de38c74e86f49124ac14f093d6a5c377a90 ]

Syzkaller reports a long-known leak of urbs in
ath9k_hif_usb_dealloc_tx_urbs().

The cause of the leak is that usb_get_urb() is called but usb_free_urb()
(or usb_put_urb()) is not called inside usb_kill_urb() as urb->dev or
urb->ep fields have not been initialized and usb_kill_urb() returns
immediately.

The patch removes trying to kill urbs located in hif_dev->tx.tx_buf
because hif_dev->tx.tx_buf is not supposed to contain urbs which are in
pending state (the pending urbs are stored in hif_dev->tx.tx_pending).
The tx.tx_lock is acquired so there should not be any changes in the list.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Fixes: 03fb92a432ea ("ath9k: hif_usb: fix race condition between usb_get_urb() and usb_kill_anchored_urbs()")
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Toke Høiland-Jørgensen <toke@toke.dk>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220725151359.283704-1-pchelkin@ispras.ru
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c
index 4d9002a..b6b5ce9 100644 (file)
--- a/drivers/net/wireless/ath/ath9k/hif_usb.c
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.c
@@ -780,14 +780,10 @@ static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
        spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
        list_for_each_entry_safe(tx_buf, tx_buf_tmp,
                                 &hif_dev->tx.tx_buf, list) {
-               usb_get_urb(tx_buf->urb);
-               spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
-               usb_kill_urb(tx_buf->urb);
                list_del(&tx_buf->list);
                usb_free_urb(tx_buf->urb);
                kfree(tx_buf->buf);
                kfree(tx_buf);
-               spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
        }
        spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);