linux-kernel - [PATCH] drivers/usb/serial/opticon.c: Release resources on kmalloc failure

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>] [day] [month] [year] [list]

Message-Id: <1305300646-10382-1-git-send-email-julia@diku.dk>
Date:	Fri, 13 May 2011 17:30:46 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	kernel-janitors@...r.kernel.org, Alon Ziv <alon-git@...aviz.org>,
	Alan Cox <alan@...ux.intel.com>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	Martin Jansen <martin.jansen@...icon.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drivers/usb/serial/opticon.c: Release resources on kmalloc failure

From: Julia Lawall <julia@...u.dk>

Several resources have been allocated before this kmalloc failure, and thus
they should be released in this error handling code, as done in nearby
error handling code.

The semantic match that finds this problem is:
(http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
local idexpression urb;
statement S;
position p1,p2;
@@

urb = usb_alloc_urb@p1(...);
... when != urb
if (urb == NULL) S
... when != urb
(
return <+...urb...+>;
|
return@p2 ...;
)

@script:python@
p1 << r.p1;
p2 << r.p2;
@@

cocci.print_main("",p1)
cocci.print_secs("",p2)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/usb/serial/opticon.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/serial/opticon.c b/drivers/usb/serial/opticon.c
index 1b5633f..96423f3 100644
--- a/drivers/usb/serial/opticon.c
+++ b/drivers/usb/serial/opticon.c
@@ -289,8 +289,11 @@ static int opticon_write(struct tty_struct *tty, struct usb_serial_port *port,
 	/* The conncected devices do not have a bulk write endpoint,
 	 * to transmit data to de barcode device the control endpoint is used */
 	dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
-	if (!dr)
-		return -ENOMEM;
+	if (!dr) {
+		dev_err(&port->dev, "out of memory\n");
+		count = -ENOMEM;
+		goto error;
+	}
 
 	dr->bRequestType = USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT;
 	dr->bRequest = 0x01;

--
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/