netdev - [PATCH] can: mcba_usb: fix potential resource leak in mcba_usb_xmit

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Date:   Sun, 20 Nov 2022 18:14:14 +0800
From:   Jianglei Nie <niejianglei2021@....com>
To:     yashi@...cecubics.com, wg@...ndegger.com, mkl@...gutronix.de,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, mailhol.vincent@...adoo.fr,
        stefan.maetje@....eu, socketcan@...tkopp.net, hbh25y@...il.com
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Jianglei Nie <niejianglei2021@....com>
Subject: [PATCH] can: mcba_usb: fix potential resource leak in mcba_usb_xmit_cmd()

mcba_usb_xmit_cmd() gets free ctx by mcba_usb_get_free_ctx(). When
mcba_usb_xmit() fails, the ctx should be freed with mcba_usb_free_ctx()
like mcba_usb_start_xmit() does in label "xmit_failed" to avoid potential
resource leak.

Fix it by calling mcba_usb_free_ctx() when mcba_usb_xmit() fails.

Signed-off-by: Jianglei Nie <niejianglei2021@....com>
---
 drivers/net/can/usb/mcba_usb.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/can/usb/mcba_usb.c b/drivers/net/can/usb/mcba_usb.c
index 218b098b261d..471f6be6e030 100644
--- a/drivers/net/can/usb/mcba_usb.c
+++ b/drivers/net/can/usb/mcba_usb.c
@@ -380,9 +380,11 @@ static void mcba_usb_xmit_cmd(struct mcba_priv *priv,
 	}
 
 	err = mcba_usb_xmit(priv, usb_msg, ctx);
-	if (err)
+	if (err) {
+		mcba_usb_free_ctx(ctx);
 		netdev_err(priv->netdev, "Failed to send cmd (%d)",
 			   usb_msg->cmd_id);
+	}
 }
 
 static void mcba_usb_xmit_change_bitrate(struct mcba_priv *priv, u16 bitrate)
-- 
2.25.1