On Mon, 22 Aug 2016, Daniel Vetter <dan...@ffwll.ch> wrote:
> On Sun, Aug 21, 2016 at 07:56:19PM +0200, Heinrich Schuchardt wrote:
>> The C standard does not specify the size of the integer used
>> to store an enum. Hence in structure drm_stats32_t alignment
>> bytes may exist.
>>
>> To avoid exposing bytes from the kernel stack it is
>> necessary to initialize variable s32 completely.
>>
>> Signed-off-by: Heinrich Schuchardt <xypron.g...@gmx.de>
>
> Applied to drm-misc, thanks.
> -Daniel
>
>> ---
>> drivers/gpu/drm/drm_ioc32.c | 1 +
>> 1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/gpu/drm/drm_ioc32.c b/drivers/gpu/drm/drm_ioc32.c
>> index 57676f8..32a489b 100644
>> --- a/drivers/gpu/drm/drm_ioc32.c
>> +++ b/drivers/gpu/drm/drm_ioc32.c
>> @@ -346,6 +346,7 @@ static int compat_drm_getstats(struct file *file,
>> unsigned int cmd,
>> struct drm_stats __user *stats;
>> int i, err;
>>
>> + memset(&s32, 0, sizeof(drm_stats32_t));
For future reference,
memset(&s32, 0, sizeof(s32));
is the better approach, avoiding problems if the type of s32 ever
changes.
BR,
Jani.
>> stats = compat_alloc_user_space(sizeof(*stats));
>> if (!stats)
>> return -EFAULT;
>> --
>> 2.1.4
>>
>> _______________________________________________
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>> dri-de...@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Jani Nikula, Intel Open Source Technology Center
