linux-kernel - [PATCH]Re: [linux-usb-devel] drivers/usb/misc/iowarrior.c: NULL dereference

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Date:	Mon, 19 Mar 2007 11:39:13 +0100
From:	Oliver Neukum <oneukum@...e.de>
To:	linux-usb-devel@...ts.sourceforge.net
Cc:	Adrian Bunk <bunk@...sta.de>,
	Christian Lucht <lucht@...emercs.com>,
	Robert Marquardt <marquardt@...emercs.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH]Re: [linux-usb-devel] drivers/usb/misc/iowarrior.c: NULL dereference

Am Montag, 19. März 2007 10:25 schrieb Adrian Bunk:
> The Coverity checker spotted the following NULL dereference:

And this fixes an oops upon allocation failures.

	Regards
		Oliver

Signed-off-by: Oliver Neukum <oneukum@...e.de>
-----

--- linux-2.6.21-rc4/drivers/usb/misc/iowarrior.c.alt	2007-03-19 11:05:37.000000000 +0100
+++ linux-2.6.21-rc4/drivers/usb/misc/iowarrior.c	2007-03-19 11:07:30.000000000 +0100
@@ -417,14 +417,14 @@
 		if (!int_out_urb) {
 			retval = -ENOMEM;
 			dbg("%s Unable to allocate urb ", __func__);
-			goto error;
+			goto error_no_urb;
 		}
 		buf = usb_buffer_alloc(dev->udev, dev->report_size,
 				       GFP_KERNEL, &int_out_urb->transfer_dma);
 		if (!buf) {
 			retval = -ENOMEM;
 			dbg("%s Unable to allocate buffer ", __func__);
-			goto error;
+			goto error_no_buffer;
 		}
 		usb_fill_int_urb(int_out_urb, dev->udev,
 				 usb_sndintpipe(dev->udev,
@@ -459,7 +459,9 @@
 error:
 	usb_buffer_free(dev->udev, dev->report_size, buf,
 			int_out_urb->transfer_dma);
+error_no_buffer:
 	usb_free_urb(int_out_urb);
+error_no_urb:
 	atomic_dec(&dev->write_busy);
 	wake_up_interruptible(&dev->write_wait);
 exit:
-
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