linux-kernel - [patch] USB: serial: fix DMA buffers on stack for io

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Date:	Wed, 30 Dec 2009 18:06:45 +0200
From:	Dan Carpenter <error27@...il.com>
To:	Johan Hovold <jhovold@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [patch] USB: serial: fix DMA buffers on stack for io_edgeport.c

The original code did DMA on a stack variable, so I made it an allocated 
pointer.

Compile tested only.

Signed-off-by: Dan Carpenter <error27@...il.com>

--- orig/drivers/usb/serial/io_edgeport.c	2009-12-30 16:20:35.000000000 +0200
+++ devel/drivers/usb/serial/io_edgeport.c	2009-12-30 16:25:27.000000000 +0200
@@ -372,21 +372,24 @@ static void update_edgeport_E2PROM(struc
  ************************************************************************/
 static int get_string(struct usb_device *dev, int Id, char *string, int buflen)
 {
-	struct usb_string_descriptor StringDesc;
+	struct usb_string_descriptor *StringDesc;
 	struct usb_string_descriptor *pStringDesc;
 
 	dbg("%s - USB String ID = %d", __func__, Id);
 
+	StringDesc = kmalloc(sizeof(*StringDesc), GFP_KERNEL);
+	if (!StringDesc)
+		return 0;
 	if (!usb_get_descriptor(dev, USB_DT_STRING, Id,
-					&StringDesc, sizeof(StringDesc)))
+					StringDesc, sizeof(*StringDesc)))
 		return 0;
 
-	pStringDesc = kmalloc(StringDesc.bLength, GFP_KERNEL);
+	pStringDesc = kmalloc(StringDesc->bLength, GFP_KERNEL);
 	if (!pStringDesc)
 		return 0;
 
 	if (!usb_get_descriptor(dev, USB_DT_STRING, Id,
-					pStringDesc, StringDesc.bLength)) {
+					pStringDesc, StringDesc->bLength)) {
 		kfree(pStringDesc);
 		return 0;
 	}
--
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