linux-kernel - Re: [PATCH][hid] Fix a NULL pointer dereference when we fail to allocate memory

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Message-ID: <Pine.LNX.4.64.0707301553240.26532@jikos.suse.cz>
Date:	Mon, 30 Jul 2007 15:56:57 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Jiri Slaby <jirislaby@...il.com>
Cc:	Jesper Juhl <jesper.juhl@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michael Haboustak <mike-@...ci.rr.com>,
	Andreas Gal <gal@....edu>, Greg Kroah-Hartman <greg@...ah.com>,
	linux-input@...ey.karlin.mff.cuni.cz
Subject: Re: [PATCH][hid] Fix a NULL pointer dereference when we fail to
 allocate memory

On Sun, 22 Jul 2007, Jiri Slaby wrote:

> > --- a/drivers/hid/usbhid/hid-core.c
> > +++ b/drivers/hid/usbhid/hid-core.c
> > @@ -743,7 +743,7 @@ static struct hid_device *usb_hid_configure(struct usb_interface *intf)
> >  	hid->quirks = quirks;
> >  
> >  	if (!(usbhid = kzalloc(sizeof(struct usbhid_device), GFP_KERNEL)))
> Out of curiosity, where is this freed?

I have queued the fix below on top of Jesper's patch, thanks.


diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c
index 3ff7468..6e73934 100644
--- a/drivers/hid/usbhid/hid-core.c
+++ b/drivers/hid/usbhid/hid-core.c
@@ -877,6 +877,7 @@ fail:
 	usb_free_urb(usbhid->urbin);
 	usb_free_urb(usbhid->urbout);
 	usb_free_urb(usbhid->urbctrl);
+	kfree(usbhid);
 fail_no_usbhid:
 	hid_free_buffers(dev, hid);
 	hid_free_device(hid);
@@ -912,6 +913,7 @@ static void hid_disconnect(struct usb_interface *intf)
 	usb_free_urb(usbhid->urbin);
 	usb_free_urb(usbhid->urbctrl);
 	usb_free_urb(usbhid->urbout);
+	kfree(usbhid);
 
 	hid_free_buffers(hid_to_usb_dev(hid), hid);
 	hid_free_device(hid);

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