From c93d81955005c2ac0ea072f88d376026208410e1 Mon Sep 17 00:00:00 2001 From: Alexey Khoroshilov Date: Sat, 16 Mar 2013 01:30:32 +0400 Subject: [PATCH] usb: cdc-acm: fix error handling in acm_probe() acm_probe() ignores errors in tty_port_register_device() and leaves intfdata pointing to freed memory on alloc_fail7 error path. The patch fixes the both issues. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov Acked-by: Oliver Neukum Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/cdc-acm.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 8ac25adf31b4..c125b61c2499 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -977,6 +977,8 @@ static int acm_probe(struct usb_interface *intf, int num_rx_buf; int i; int combined_interfaces = 0; + struct device *tty_dev; + int rv = -ENOMEM; /* normal quirks */ quirks = (unsigned long)id->driver_info; @@ -1339,11 +1341,24 @@ skip_countries: usb_set_intfdata(data_interface, acm); usb_get_intf(control_interface); - tty_port_register_device(&acm->port, acm_tty_driver, minor, + tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor, &control_interface->dev); + if (IS_ERR(tty_dev)) { + rv = PTR_ERR(tty_dev); + goto alloc_fail8; + } return 0; +alloc_fail8: + if (acm->country_codes) { + device_remove_file(&acm->control->dev, + &dev_attr_wCountryCodes); + device_remove_file(&acm->control->dev, + &dev_attr_iCountryCodeRelDate); + } + device_remove_file(&acm->control->dev, &dev_attr_bmCapabilities); alloc_fail7: + usb_set_intfdata(intf, NULL); for (i = 0; i < ACM_NW; i++) usb_free_urb(acm->wb[i].urb); alloc_fail6: @@ -1359,7 +1374,7 @@ alloc_fail2: acm_release_minor(acm); kfree(acm); alloc_fail: - return -ENOMEM; + return rv; } static void stop_data_traffic(struct acm *acm) -- 2.34.1