[PATCH 2/2] Return the result from user admin command IOCTL even in case of failureX

[Chayan Biswas]

I am going to resubmit the patch today.

Thanks,
Chayan

> -----Original Message-----
> From: Matthew Wilcox [mailto:willy at linux.intel.com]
> Sent: Wednesday, May 22, 2013 1:24 PM
> To: Keith Busch
> Cc: Chayan Biswas; linux-nvme at lists.infradead.org
> Subject: Re: [PATCH 2/2] Return the result from user admin command IOCTL
> even in case of failureX
>
> On Fri, Mar 01, 2013 at 03:05:06PM -0700, Keith Busch wrote:
> > On Thu, 28 Feb 2013, Chayan Biswas wrote:
> > >-       if (!status && copy_to_user(&ucmd->result, &cmd.result,
> > >-
> sizeof(cmd.result)))
> > >+       if (copy_to_user(&ucmd->result, &cmd.result,
> sizeof(cmd.result)))
> > >               status = -EFAULT;
> >
> > I think you want to change this to a check for 'status >= 0' before
> > copying the result to the user since a status < 0 means the command was
> > not completed by the controller (successfully or otherwise) and you'd
> > be copying uninitialized data to the user in that case.
>
> Going back through my old patches ... Chayan, do you want to make the
> change Keith suggested and resubmit?  Or do you think he's wrong?


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