From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Ashish Kalra <eashishkalra@gmail.com>
Cc: Joe Perches <joe@perches.com>,
Abheek Dhawan <adawesomeguy222@gmail.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Romain Perier <romain.perier@gmail.com>,
Waiman Long <longman@redhat.com>,
Allen Pais <apais@linux.microsoft.com>,
Ivan Safonov <insafonov@gmail.com>,
linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] staging: wlan-ng: silence incorrect type in argument 1 (different address spaces) warning
Date: Sat, 24 Apr 2021 10:28:27 +0200 [thread overview]
Message-ID: <YIPWq6rp246rg9D0@kroah.com> (raw)
In-Reply-To: <20210424081529.GA1731@ubuntu>
On Sat, Apr 24, 2021 at 01:45:29PM +0530, Ashish Kalra wrote:
> On Fri, Apr 23, 2021 at 11:11:05PM -0700, Joe Perches wrote:
> > On Sat, 2021-04-24 at 08:00 +0200, Greg Kroah-Hartman wrote:
> > > On Fri, Apr 23, 2021 at 08:56:19PM +0530, Ashish Kalra wrote:
> > > > On Thu, Apr 22, 2021 at 10:43:13AM +0200, Greg Kroah-Hartman wrote:
> > > > > On Tue, Apr 20, 2021 at 02:31:42PM +0530, Ashish Kalra wrote:
> > > > > > Upon running sparse, "warning: incorrect type in argument 1 (different address spaces)
> > > > > > is brought to notice for this file.let's add correct typecast to make it cleaner and
> > > > > > silence the Sparse warning.
> > []
> > > > struct p80211ioctl_req {
> > > > char name[WLAN_DEVNAMELEN_MAX];
> > > > - caddr_t data;
> > > > + void __user *data;
> > > >
> > > > Does this looks ok to you and is there any other check possible if this is ok?
> > >
> > > Wait, what is "caddr_t"? Try unwinding that mess first...
> >
> > Might not be that simple.
> >
> > include/linux/types.h:typedef __kernel_caddr_t caddr_t;
> > include/uapi/linux/coda.h:typedef void * caddr_t;
> > include/uapi/asm-generic/posix_types.h:typedef char * __kernel_caddr_t;
> >
> >
> data is part of p80211ioctl_req and is used at two places only inside p80211knetdev_do_ioctl
> it seems both places it will be used as void __user* only
>
> msgbuf = memdup_user(req->data, req->len);
>
> if (result == 0) {
> if (copy_to_user
> ((void __user *)req->data, msgbuf, req->len)) {
> result = -EFAULT;
> }
> }
>
> Will it still be problem if we change it from char * to void *.?
Why do you want to change it to void *? Never use a void * unless it
has to point to unknown data. That does not seem the case here.
> is there any way to check how caller of this function will be using it?
Look at the code to determine this...
thanks,
greg k-h
next prev parent reply other threads:[~2021-04-24 8:28 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-20 9:01 [PATCH] staging: wlan-ng: silence incorrect type in argument 1 (different address spaces) warning Ashish Kalra
2021-04-22 8:43 ` Greg Kroah-Hartman
2021-04-23 15:26 ` Ashish Kalra
2021-04-24 5:59 ` Greg Kroah-Hartman
2021-04-24 6:00 ` Greg Kroah-Hartman
2021-04-24 6:11 ` Joe Perches
2021-04-24 8:15 ` Ashish Kalra
2021-04-24 8:28 ` Greg Kroah-Hartman [this message]
2021-04-27 12:23 ` ashish
2021-04-27 12:39 ` Greg Kroah-Hartman
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