linux-kernel - [PATCH 2/2] rtl818x: Kill URBs before clearing tx status queue

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Message-ID: <20250616101050.6911-3-d.dulov@aladdin.ru>
Date: Mon, 16 Jun 2025 13:10:50 +0300
From: Daniil Dulov <d.dulov@...ddin.ru>
To: Hin-Tak Leung <hintak.leung@...il.com>
CC: Daniil Dulov <d.dulov@...ddin.ru>, Larry Finger
	<Larry.Finger@...inger.net>, "John W. Linville" <linville@...driver.com>,
	<linux-wireless@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<lvc-project@...uxtesting.org>
Subject: [PATCH 2/2] rtl818x: Kill URBs before clearing tx status queue

In rtl8187_stop() move the call of usb_kill_anchored_urbs() before clearing
b_tx_status.queue. This change prevents callbacks from using already freed
skb due to anchor was not killed before freeing such skb.

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

Fixes: c1db52b9d27e ("rtl8187: Use usb anchor facilities to manage urbs")
Signed-off-by: Daniil Dulov <d.dulov@...ddin.ru>
---
 drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c b/drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c
index 8fe6fdc32e56..12e2042ee2d0 100644
--- a/drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c
+++ b/drivers/net/wireless/realtek/rtl818x/rtl8187/dev.c
@@ -1050,10 +1050,10 @@ static void rtl8187_stop(struct ieee80211_hw *dev, bool suspend)
 	rtl818x_iowrite8(priv, &priv->map->CONFIG4, reg | RTL818X_CONFIG4_VCOOFF);
 	rtl818x_iowrite8(priv, &priv->map->EEPROM_CMD, RTL818X_EEPROM_CMD_NORMAL);
 
+	usb_kill_anchored_urbs(&priv->anchored);
 	while ((skb = skb_dequeue(&priv->b_tx_status.queue)))
 		dev_kfree_skb_any(skb);
 
-	usb_kill_anchored_urbs(&priv->anchored);
 	mutex_unlock(&priv->conf_mutex);
 
 	if (!priv->is_rtl8187b)
-- 
2.34.1