linux-kernel - [16/18] usb: iowarrior: dont trust report

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Message-Id: <20110305010353.383259429@clark.kroah.org>
Date:	Fri, 04 Mar 2011 17:03:10 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Kees Cook <kees.cook@...onical.com>,
	Brandon Philips <bphilips@...e.de>
Subject: [16/18] usb: iowarrior: dont trust report_size for buffer size

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Kees Cook <kees.cook@...onical.com>

commit 3ed780117dbe5acb64280d218f0347f238dafed0 upstream.

If the iowarrior devices in this case statement support more than 8 bytes
per report, it is possible to write past the end of a kernel heap allocation.
This will probably never be possible, but change the allocation to be more
defensive anyway.

Signed-off-by: Kees Cook <kees.cook@...onical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
Acked-by: Brandon Philips <bphilips@...e.de>


---
 drivers/usb/misc/iowarrior.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/misc/iowarrior.c
+++ b/drivers/usb/misc/iowarrior.c
@@ -373,7 +373,7 @@ static ssize_t iowarrior_write(struct fi
 	case USB_DEVICE_ID_CODEMERCS_IOWPV2:
 	case USB_DEVICE_ID_CODEMERCS_IOW40:
 		/* IOW24 and IOW40 use a synchronous call */
-		buf = kmalloc(8, GFP_KERNEL);	/* 8 bytes are enough for both products */
+		buf = kmalloc(count, GFP_KERNEL);
 		if (!buf) {
 			retval = -ENOMEM;
 			goto exit;


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