linux-kernel - [PATCH] usb: core: Remove unnecessary memset()

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20181204143143.8407-1-suwan.kim027@gmail.com>
Date:   Tue,  4 Dec 2018 23:31:43 +0900
From:   Suwan Kim <suwan.kim027@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     stern@...land.harvard.edu, linux-usb@...r.kernel.org,
        mathias.nyman@...ux.intel.com, heikki.krogerus@...ux.intel.com,
        linux-kernel@...r.kernel.org, balbi@...nel.org
Subject: [PATCH] usb: core: Remove unnecessary memset()

register_root_hub() calls memset() setting usb_dev->bus->devmap.
devicemap to 0 during hcd probe function (usb_hcd_pci_probe). But
in previous function which is also the procedure of usb_hcd_pci_probe(),
usb_bus_init() already initialized bus->devmap calling memset().
Furthermore, register_root_hub() is called only once in kernel.
So, calling memset() which resets usb_bus->devmap.devicemap in
register_root_hub() is redundant.

Signed-off-by: Suwan Kim <suwan.kim027@...il.com>
---
 drivers/usb/core/hcd.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 487025d31d44..015b126ce455 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -1074,8 +1074,6 @@ static int register_root_hub(struct usb_hcd *hcd)
 
 	usb_dev->devnum = devnum;
 	usb_dev->bus->devnum_next = devnum + 1;
-	memset (&usb_dev->bus->devmap.devicemap, 0,
-			sizeof usb_dev->bus->devmap.devicemap);
 	set_bit (devnum, usb_dev->bus->devmap.devicemap);
 	usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
 
-- 
2.19.2