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  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]
Date:	Thu, 15 Mar 2012 10:23:55 +0900
From:	Yongsul@...r.kernel.org, Oh@...r.kernel.org
To:	Felipe Balbi <balbi@...com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	"yongsul96.oh@...sung.com" <yongsul96.oh@...sung.com>
Subject: [PATCH] USB: Gadget: Composite: Added error handling codes to prevent
 a memory leak case when the configuration's bind function failed

From: yongsul96.oh@...sung.com <yongsul96.oh@...sung.com>

 In some usb gadget driver, for example usb gadget serial driver(serial.c),
multifunction composite driver(multi,c), nokia composite gadget driver(nokia.c),
HID composite driver(hid.c), CDC composite driver(cdc2.c).., the configuration's
bind function by called the 'usb_add_config()' has multiple bind config functions
for each functionality, for example cdc2 configuration bind function -'cdc_do_config()'
has two functionality bind config functions -'ecm_bind_config()' & 'acm_bind_config()'
in CDC composite driver.
 In each functionality bind config function, new instance for each functionality is
allocated & initialized by 'kzalloc()' ,and finally the new instance is added by
'usb_add_function()'. After 'usb_add_function' state, already created the instance
is only handled by its configuration & freed from functionality unbind function.
 So, If an error occurred during the second functionality bind config state, for example
an error occurred at 'acm_bind_config()' after succeeding 'ecm_bind_function()',
The created instance by 'acm_bind_config()' cannot be freed.
And it makes memory leak situation.

This patch fixes this issue.

Signed-off-by: yongsul96.oh@...sung.com <yongsul96.oh@...sung.com>
---
 drivers/usb/gadget/composite.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index baaebf2..4cb1801 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -737,6 +737,19 @@ int usb_add_config(struct usb_composite_dev *cdev,
 
 	status = bind(config);
 	if (status < 0) {
+		while (!list_empty(&config->functions)) {
+			struct usb_function		*f;
+
+			f = list_first_entry(&config->functions,
+					struct usb_function, list);
+			list_del(&f->list);
+			if (f->unbind) {
+				DBG(cdev, "unbind function '%s'/%p\n",
+					f->name, f);
+				f->unbind(config, f);
+				/* may free memory for "f" */
+			}
+		}
 		list_del(&config->list);
 		config->cdev = NULL;
 	} else {
-- 
1.7.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists