linux-kernel - Re: [PATCH] staging: unisys: virtpci: virtpci: Fix for possible null pointer dereference

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Message-ID: <54CB8047.3040300@hurleysoftware.com>
Date:	Fri, 30 Jan 2015 07:59:51 -0500
From:	Peter Hurley <peter@...leysoftware.com>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Benjamin Romer <benjamin.romer@...sys.com>,
	David Kershner <david.kershner@...sys.com>,
	devel@...verdev.osuosl.org,
	Erik Arfvidson <erik.arfvidson@...sys.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	sparmaintainer@...sys.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: unisys: virtpci: virtpci: Fix for possible null
 pointer dereference

On 01/30/2015 07:39 AM, Dan Carpenter wrote:
> Btw, if you have the smatch cross function database set up then you can
> figure out this sort of thing by using:
> 
> $ smdb.py virtpci_driver_attr_store
> 
> It says that:
> 
>      fs/sysfs/file.c |       sysfs_kf_write | (struct sysfs_ops)->store |  PARAM_VALUE |  0 | $ | 4096-2117777777777777777
> 
> So this is called from sysfs_kf_write() and parameter zero is a valid
> pointer.

Hi Dan,

This would be a good topic for an LWN.net article.

Regards,
Peter Hurley

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