linux-kernel - Re: [PATCH] Staging: rtl8192e: Fix potential NULL pointer dereference

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Date:	Wed, 2 Jul 2014 10:32:55 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Emil Goode <emilgoode@...il.com>
Cc:	Rashika Kheria <rashika.kheria@...il.com>,
	Valentina Manea <valentina.manea.m@...il.com>,
	Josh Triplett <josh@...htriplett.org>,
	Andrea Merello <andrea.merello@...il.com>,
	devel@...verdev.osuosl.org, kernel-janitors@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Staging: rtl8192e: Fix potential NULL pointer dereference

On Wed, Jul 02, 2014 at 07:26:20PM +0200, Emil Goode wrote:
> Hello Greg,
> 
> On Wed, Jul 02, 2014 at 09:33:34AM -0700, Greg Kroah-Hartman wrote:
> > On Wed, Jul 02, 2014 at 11:25:51AM +0200, Emil Goode wrote:
> > > We need to make sure the struct rtllib_device pointer ieee is not NULL
> > > after the goto rx_dropped label since it is dereferenced there.
> > > 
> > > Signed-off-by: Emil Goode <emilgoode@...il.com>
> > > ---
> > >  drivers/staging/rtl8192e/rtllib_rx.c |    3 ++-
> > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/staging/rtl8192e/rtllib_rx.c b/drivers/staging/rtl8192e/rtllib_rx.c
> > > index 60de54c..7db3e74 100644
> > > --- a/drivers/staging/rtl8192e/rtllib_rx.c
> > > +++ b/drivers/staging/rtl8192e/rtllib_rx.c
> > > @@ -1496,7 +1496,8 @@ int rtllib_rx(struct rtllib_device *ieee, struct sk_buff *skb,
> > >  	return ret;
> > >  
> > >   rx_dropped:
> > > -	ieee->stats.rx_dropped++;
> > > +	if (ieee)
> > > +		ieee->stats.rx_dropped++;
> > >  	return 0;
> > >  }
> > >  EXPORT_SYMBOL(rtllib_rx);
> > 
> > Is this something that is hitting users today in the tree, or is this
> > just a bug you found looking at the code?
> 
> It's a static checker fix and I'm not aware of any impact on users.
> If you want I will resend with that information added?

No, that's fine, just trying to see which kernel to apply this to...

thanks,

greg k-h
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