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Date:   Fri, 16 Feb 2018 20:55:30 -0800
From:   Kees Cook <keescook@chromium.org>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Keith Packard <keithp@keithp.com>
Cc:     linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org
Subject: [PATCH] USB: chaoskey: Use kasprintf() over strcpy()/strcat()
Message-ID: <20180217045530.GA24226@beast>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Instead of kmalloc() with manually calculated values followed by
multiple strcpy()/strcat() calls, just fold it all into a single
kasprintf() call.

Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/usb/misc/chaoskey.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/misc/chaoskey.c b/drivers/usb/misc/chaoskey.c
index 716cb515523e..cf5828ce927a 100644
--- a/drivers/usb/misc/chaoskey.c
+++ b/drivers/usb/misc/chaoskey.c
@@ -168,14 +168,10 @@ static int chaoskey_probe(struct usb_interface *interface,
 	 */
 
 	if (udev->product && udev->serial) {
-		dev->name = kmalloc(strlen(udev->product) + 1 +
-				    strlen(udev->serial) + 1, GFP_KERNEL);
+		dev->name = kasprintf(GFP_KERNEL, "%s-%s", udev->product,
+				      udev->serial);
 		if (dev->name == NULL)
 			goto out;
-
-		strcpy(dev->name, udev->product);
-		strcat(dev->name, "-");
-		strcat(dev->name, udev->serial);
 	}
 
 	dev->interface = interface;
-- 
2.7.4


-- 
Kees Cook
Pixel Security