| Message ID | 20220725151359.283704-1-pchelkin@ispras.ru |
|---|---|
| State | New |
| Headers | show |
| Series | ath9k: hif_usb: fix memory leak of urbs in ath9k_hif_usb_dealloc_tx_urbs() | expand |
Fedor Pchelkin <pchelkin@ispras.ru> wrote: > 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> Patch applied to ath-next branch of ath.git, thanks. c2a94de38c74 wifi: ath9k: hif_usb: fix memory leak of urbs in ath9k_hif_usb_dealloc_tx_urbs()
diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c index 518deb5098a2..2d2cd895a9d4 100644 --- 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);
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> --- drivers/net/wireless/ath/ath9k/hif_usb.c | 4 ---- 1 file changed, 4 deletions(-)