linux-kernel - [PATCH 3.10 061/250] USB: serial: kl5kusb105: abort on open exception path

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Message-Id: <1496876436-32402-62-git-send-email-w@1wt.eu>
Date:   Thu,  8 Jun 2017 00:57:27 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Pan Bian <bianpan2016@....com>, Johan Hovold <johan@...nel.org>,
        Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 061/250] USB: serial: kl5kusb105: abort on open exception path

From: Pan Bian <bianpan2016@....com>

commit 3c3dd1e058cb01e835dcade4b54a6f13ffaeaf7c upstream.

Function klsi_105_open() calls usb_control_msg() (to "enable read") and
checks its return value. When the return value is unexpected, it only
assigns the error code to the return variable retval, but does not
terminate the exception path. This patch fixes the bug by inserting
"goto err_generic_close;" when the call to usb_control_msg() fails.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Pan Bian <bianpan2016@....com>
[johan: rebase on prerequisite fix and amend commit message]
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/usb/serial/kl5kusb105.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/serial/kl5kusb105.c b/drivers/usb/serial/kl5kusb105.c
index 70e163d..69eb056 100644
--- a/drivers/usb/serial/kl5kusb105.c
+++ b/drivers/usb/serial/kl5kusb105.c
@@ -319,6 +319,7 @@ static int  klsi_105_open(struct tty_struct *tty, struct usb_serial_port *port)
 	if (rc < 0) {
 		dev_err(&port->dev, "Enabling read failed (error = %d)\n", rc);
 		retval = rc;
+		goto err_generic_close;
 	} else
 		dev_dbg(&port->dev, "%s - enabled reading\n", __func__);
 
@@ -345,6 +346,7 @@ err_disable_read:
 			     0, /* index */
 			     NULL, 0,
 			     KLSI_TIMEOUT);
+err_generic_close:
 	usb_serial_generic_close(port);
 err_free_cfg:
 	kfree(cfg);
-- 
2.8.0.rc2.1.gbe9624a