netdev - Re: [patch] vxge: potential NULL dereference

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Date:	Fri, 10 Sep 2010 13:32:55 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	error27@...il.com
Cc:	ramkrishna.vepa@...r.com, sivakumar.subramani@...r.com,
	sreenivasa.honnur@...r.com, jon.mason@...r.com,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] vxge: potential NULL dereference

From: Dan Carpenter <error27@...il.com>
Date: Fri, 10 Sep 2010 13:54:23 +0200

> At the start of the function we test whether the "vpath" is NULL but we
> need another test here as well.
> 
> Signed-off-by: Dan Carpenter <error27@...il.com>
> ---
> This is a static checker bug, I'm not sure if we ever pass a NULL
> pointer for "vpath".

I cannot see any case where this can happen.  There are two
cases:

1) __vxge_hw_vpath_alarm_process() is invoked via vxge_hw_device_begin_irq(),
   which looks like:

			ret = __vxge_hw_vpath_alarm_process(
				&hldev->virtual_paths[i], skip_alarms);

   that vpath pointer first argument will never be NULL.

2) __vxge_hw_vpath_alarm_process() is invoked via vxge_hw_vpath_alarm_process()
   which uses:

	status = __vxge_hw_vpath_alarm_process(vp->vpath, skip_alarms);

   All vpath valid active vpath handles always have a non-NULL vp->vpath
   virtual path back pointer, as setup by vxge_hw_vpath_open():

 ...
	vp->vpath = vpath;
...
	*vpath_handle = vp;

	attr->fifo_attr.userdata = vpath->fifoh;
	attr->ring_attr.userdata = vpath->ringh;

	return VXGE_HW_OK;

So we can simply remove the first NULL check as this can never actually
be NULL.
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