linux-kernel - [PATCH rtw-next v2 2/7] wifi: rtw89: usb: fix leak in rtw89_usb_write

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251002200857.657747-3-pchelkin@ispras.ru>
Date: Thu,  2 Oct 2025 23:08:47 +0300
From: Fedor Pchelkin <pchelkin@...ras.ru>
To: Ping-Ke Shih <pkshih@...ltek.com>,
	Bitterblue Smith <rtl8821cerfe2@...il.com>
Cc: Fedor Pchelkin <pchelkin@...ras.ru>,
	Zong-Zhe Yang <kevin_yang@...ltek.com>,
	Po-Hao Huang <phhuang@...ltek.com>,
	linux-wireless@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org
Subject: [PATCH rtw-next v2 2/7] wifi: rtw89: usb: fix leak in rtw89_usb_write_port()

When there is an attempt to write data and RTW89_FLAG_UNPLUGGED is set,
this means device is disconnected and no urb is submitted.  Return
appropriate error code to the caller to properly free the allocated
resources.

Found by Linux Verification Center (linuxtesting.org).

Fixes: 2135c28be6a8 ("wifi: rtw89: Add usb.{c,h}")
Signed-off-by: Fedor Pchelkin <pchelkin@...ras.ru>
Acked-by: Ping-Ke Shih <pkshih@...ltek.com>
---
 drivers/net/wireless/realtek/rtw89/usb.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw89/usb.c b/drivers/net/wireless/realtek/rtw89/usb.c
index e8e064cf7e0a..512a46dd9d06 100644
--- a/drivers/net/wireless/realtek/rtw89/usb.c
+++ b/drivers/net/wireless/realtek/rtw89/usb.c
@@ -256,7 +256,7 @@ static int rtw89_usb_write_port(struct rtw89_dev *rtwdev, u8 ch_dma,
 	int ret;
 
 	if (test_bit(RTW89_FLAG_UNPLUGGED, rtwdev->flags))
-		return 0;
+		return -ENODEV;
 
 	urb = usb_alloc_urb(0, GFP_ATOMIC);
 	if (!urb)
@@ -305,8 +305,9 @@ static void rtw89_usb_ops_tx_kick_off(struct rtw89_dev *rtwdev, u8 txch)
 		ret = rtw89_usb_write_port(rtwdev, txch, skb->data, skb->len,
 					   txcb);
 		if (ret) {
-			rtw89_err(rtwdev, "write port txch %d failed: %d\n",
-				  txch, ret);
+			if (ret != -ENODEV)
+				rtw89_err(rtwdev, "write port txch %d failed: %d\n",
+					  txch, ret);
 
 			skb_dequeue(&txcb->tx_ack_queue);
 			kfree(txcb);
-- 
2.51.0