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usb: hso: check for return value in hso_serial_common_create()

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[ 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@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=67b2bd0e34f952d0321e
Signed-off-by: Rustam Kovhaev <rkovhaev@gmail.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rustam Kovhaev 2020-07-27 23:42:17 -07:00 • committed by Greg Kroah-Hartman
commit fd601f38f5
1 changed files with 4 additions and 1 deletions
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5
drivers/net/usb/hso.c
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@ -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;
}