linux-kernel - [PATCH 5.4 38/67] usb: hso: check for return value in hso_serial_common

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Date:   Mon, 10 Aug 2020 17:21:25 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Rustam Kovhaev <rkovhaev@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>,
        syzbot+67b2bd0e34f952d0321e@...kaller.appspotmail.com
Subject: [PATCH 5.4 38/67] usb: hso: check for return value in hso_serial_common_create()

From: Rustam Kovhaev <rkovhaev@...il.com>

[ Upstream commit e911e99a0770f760377c263bc7bac1b1593c6147 ]

in case of an error tty_register_device_attr() returns ERR_PTR(),
add IS_ERR() check

Reported-and-tested-by: syzbot+67b2bd0e34f952d0321e@...kaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=67b2bd0e34f952d0321e
Signed-off-by: Rustam Kovhaev <rkovhaev@...il.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/usb/hso.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index 66a8b835aa94c..7449b97a3c89b 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -2260,12 +2260,14 @@ static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
 
 	minor = get_free_serial_index();
 	if (minor < 0)
-		goto exit;
+		goto exit2;
 
 	/* register our minor number */
 	serial->parent->dev = tty_port_register_device_attr(&serial->port,
 			tty_drv, minor, &serial->parent->interface->dev,
 			serial->parent, hso_serial_dev_groups);
+	if (IS_ERR(serial->parent->dev))
+		goto exit2;
 
 	/* fill in specific data for later use */
 	serial->minor = minor;
@@ -2310,6 +2312,7 @@ static int hso_serial_common_create(struct hso_serial *serial, int num_urbs,
 	return 0;
 exit:
 	hso_serial_tty_unregister(serial);
+exit2:
 	hso_serial_common_free(serial);
 	return -1;
 }
-- 
2.25.1