linux-kernel - Re: [PATCH v2 08/11] staging/android: make info->len return only the size of fence

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Date:	Tue, 2 Feb 2016 16:46:00 -0200
From:	Gustavo Padovan <gustavo@...ovan.org>
To:	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	dri-devel@...ts.freedesktop.org,
	Daniel Stone <daniels@...labora.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Riley Andrews <riandrews@...roid.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Rob Clark <robdclark@...il.com>,
	Greg Hackmann <ghackmann@...gle.com>,
	John Harrison <John.C.Harrison@...el.com>,
	Gustavo Padovan <gustavo.padovan@...labora.co.uk>
Subject: Re: [PATCH v2 08/11] staging/android: make info->len return only the
 size of fence_infos

2016-02-02 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>:

> Op 02-02-16 om 14:23 schreef Gustavo Padovan:
> > From: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> >
> > The len member of struct sync_file_info was returning the size of the whole
> > buffer (struct sync_file_info + fence_infos at the of it). This commit
> > change it to return only the size of the array of fence_infos.
> >
> > It also moves len to be right before the fences_infos struct.
> >
> > Signed-off-by: Gustavo Padovan <gustavo.padovan@...labora.co.uk>
> > ---
> >  drivers/staging/android/sync.c      | 16 +++++++++++-----
> >  drivers/staging/android/uapi/sync.h |  7 +++----
> >  2 files changed, 14 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/staging/android/sync.c b/drivers/staging/android/sync.c
> > index ba7d461..e5fbf5a 100644
> > --- a/drivers/staging/android/sync.c
> > +++ b/drivers/staging/android/sync.c
> > @@ -502,14 +502,19 @@ static int sync_fill_fence_info(struct fence *fence, void *data, int size)
> >  static long sync_file_ioctl_fence_info(struct sync_file *sync_file,
> >  					unsigned long arg)
> >  {
> > -	struct sync_file_info *info;
> > +	struct sync_file_info in, *info;
> >  	__u32 size;
> > -	__u32 len = 0;
> > +	__u32 b_len, len = 0;
> >  	int ret, i;
> >  
> > -	if (copy_from_user(&size, (void __user *)arg, sizeof(size)))
> > +	if (copy_from_user(&in, (void __user *)arg, sizeof(*info)))
> >  		return -EFAULT;
> >  
> > +	if (in.name || in.status || in.num_fences || in.fence_info)
> > +		return -EFAULT;
> >
> Did you test this? I think in.name is always true..

Ugh, no! These checks were last change I made so I think I forgot to
test them properly.

	Gustavo