linux-kernel - [PATCH] Fix a potential NULL pointer dereference in usbat_check_status() in drivers/usb/storage/shuttle

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Date:	Tue, 04 Sep 2007 16:25:05 +0800
From:	Micah Gruber <micah.gruber@...il.com>
To:	linux-kernel@...r.kernel.org,
	linux-usb-devel@...ts.sourceforge.net, gregkh@...e.de
Subject: [PATCH] Fix a potential NULL pointer dereference in usbat_check_status()
 in drivers/usb/storage/shuttle_usbat.c

This patch fixes a potential null dereference bug where we dereference us before a null check. This patch simply moves the dereferencing after the null check.

Signed-off-by: Micah Gruber <micah.gruber@...il.com>
---

--- a/drivers/usb/storage/shuttle_usbat.c
+++ b/drivers/usb/storage/shuttle_usbat.c
@@ -187,12 +187,14 @@
  */
 static int usbat_check_status(struct us_data *us)
 {
-	unsigned char *reply = us->iobuf;
+	unsigned char *reply;
 	int rc;
 
 	if (!us)
 		return USB_STOR_TRANSPORT_ERROR;
 
+	reply = us->iobuf;
+
 	rc = usbat_get_status(us, reply);
 	if (rc != USB_STOR_XFER_GOOD)
 		return USB_STOR_TRANSPORT_FAILED;

-
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