From d0ef90b49857b403c1cfa62fce229c967dd4be40 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <error27@gmail.com>
Date: Thu, 31 Dec 2009 17:42:55 +0200
Subject: [PATCH] USB: serial: fix DMA buffers on stack for io_edgeport.c
The original code was passing a stack variable as a dma buffer, so I
made it an allocated variable. Instead of adding a bunch of kfree()
calls, I changed all the error return paths to gotos.
Also I noticed that the error checking wasn't correct because
usb_get_descriptor() can return negative values.
While I was at it, I made an unrelated white space change by moving
the unicode_to_ascii() on to one line.
Signed-off-by: Dan Carpenter <error27@gmail.com>
Cc: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/usb/serial/io_edgeport.c | 35 ++++++++++++++++----------------
1 file changed, 18 insertions(+), 17 deletions(-)
diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index b97960ac92f276..09456002bac017 100644
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -372,31 +372,32 @@ static void update_edgeport_E2PROM(struct edgeport_serial *edge_serial)
************************************************************************/
static int get_string(struct usb_device *dev, int Id, char *string, int buflen)
{
- struct usb_string_descriptor StringDesc;
- struct usb_string_descriptor *pStringDesc;
+ struct usb_string_descriptor *StringDesc = NULL;
+ struct usb_string_descriptor *pStringDesc = NULL;
+ int ret = 0;
dbg("%s - USB String ID = %d", __func__, Id);
- if (!usb_get_descriptor(dev, USB_DT_STRING, Id,
- &StringDesc, sizeof(StringDesc)))
- return 0;
+ StringDesc = kmalloc(sizeof(*StringDesc), GFP_KERNEL);
+ if (!StringDesc)
+ goto free;
+ if (usb_get_descriptor(dev, USB_DT_STRING, Id, StringDesc, sizeof(*StringDesc)) <= 0)
+ goto free;
- pStringDesc = kmalloc(StringDesc.bLength, GFP_KERNEL);
+ pStringDesc = kmalloc(StringDesc->bLength, GFP_KERNEL);
if (!pStringDesc)
- return 0;
+ goto free;
- if (!usb_get_descriptor(dev, USB_DT_STRING, Id,
- pStringDesc, StringDesc.bLength)) {
- kfree(pStringDesc);
- return 0;
- }
-
- unicode_to_ascii(string, buflen,
- pStringDesc->wData, pStringDesc->bLength/2);
+ if (usb_get_descriptor(dev, USB_DT_STRING, Id, pStringDesc, StringDesc->bLength) <= 0)
+ goto free;
- kfree(pStringDesc);
+ unicode_to_ascii(string, buflen, pStringDesc->wData, pStringDesc->bLength/2);
+ ret = strlen(string);
dbg("%s - USB String %s", __func__, string);
- return strlen(string);
+free:
+ kfree(StringDesc);
+ kfree(pStringDesc);
+ return ret;
}
--
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