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

[Dan Carpenter <dan.carpenter@oracle.com>]

Run your patches through checkpatch.pl.

On Thu, Jan 29, 2015 at 07:50:26PM +0100, Rickard Strandqvist wrote:
> -	if (dprivate != NULL)
> +	if (dprivate != NULL) {

This is a double negative.  Just say "if (dprivate) {".  Actually just
reverse the test and remove the bogus printk.  Say:

	if (!dprivate)
		return 0;

But *actually* just remove the test entirely because it can never be
NULL.  Same for virtpci_driver_attr_store().

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.

regards,
dan carpenter