linux-kernel - [PATCH] ath9k: revert "ath9k: hif_usb: fix race condition between usb_get_urb() and usb_kill_anchored

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Date:   Mon, 12 Oct 2020 18:08:09 -0400
From:   Brooke Basile <brookebasile@...il.com>
To:     kvalo@...eaurora.org, davem@...emloft.net, kuba@...nel.org
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Brooke Basile <brookebasile@...il.com>
Subject: [PATCH] ath9k: revert "ath9k: hif_usb: fix race condition between usb_get_urb() and usb_kill_anchored_urbs()"

A bug in USB/IP previously caused all syzkaller USB fuzzing instances to
return false positives when testing crash reproducers.
This patch reverts changes made in commit 03fb92a432ea which, due to
this bug, returned false positives when tested and introduced new
regressions.

Fixes: 03fb92a432ea ("ath9k: hif_usb: fix race condition between usb_get_urb() and usb_kill_anchored_urbs()")
Signed-off-by: Brooke Basile <brookebasile@...il.com>
---
 drivers/net/wireless/ath/ath9k/hif_usb.c | 19 -------------------
 1 file changed, 19 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/hif_usb.c b/drivers/net/wireless/ath/ath9k/hif_usb.c
index 860da13bfb6a..38f07420f4f9 100644
--- a/drivers/net/wireless/ath/ath9k/hif_usb.c
+++ b/drivers/net/wireless/ath/ath9k/hif_usb.c
@@ -449,19 +449,10 @@ static void hif_usb_stop(void *hif_handle)
 	spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 
 	/* The pending URBs have to be canceled. */
-	spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 	list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 				 &hif_dev->tx.tx_pending, 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);
 
 	usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 }
@@ -771,37 +762,27 @@ static void ath9k_hif_usb_dealloc_tx_urbs(struct hif_device_usb *hif_dev)
 	struct tx_buf *tx_buf = NULL, *tx_buf_tmp = NULL;
 	unsigned long flags;
 
-	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);
 
 	spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 	hif_dev->tx.flags |= HIF_USB_TX_FLUSH;
 	spin_unlock_irqrestore(&hif_dev->tx.tx_lock, flags);
 
-	spin_lock_irqsave(&hif_dev->tx.tx_lock, flags);
 	list_for_each_entry_safe(tx_buf, tx_buf_tmp,
 				 &hif_dev->tx.tx_pending, 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);
 
 	usb_kill_anchored_urbs(&hif_dev->mgmt_submitted);
 }
-- 
2.28.0