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 15:18:46 +0100
From:	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
To:	Gustavo Padovan <gustavo@...ovan.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	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

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..