Em Fri, 06 Apr 2018 18:54:50 +0300
Laurent Pinchart escreveu:
> Hi Mauro,
>
> Thank you for the patch.
>
> On Friday, 6 April 2018 17:23:19 EEST Mauro Carvalho Chehab wrote:
> > That prevent those warnings:
> >drivers/media/platform/omap3isp/isppreview.c:893:45: warning: incorrect
> > type in initializer (different address spaces)
> > drivers/media/platform/omap3isp/isppreview.c:893:45:expected void
> > [noderef] *from drivers/media/platform/omap3isp/isppreview.c:893:45:
> >got void *[noderef]
> > drivers/media/platform/omap3isp/isppreview.c:893:47: warning: dereference
> > of noderef expression
>
> That's nice, but it would be even nicer to explain what the problem is and
> how
> you fix it, otherwise one might be left wondering if the fix is correct, or
> if
> it could be a false positive.
Ok. Please see the enclosed patch.
> With the commit message updated,
>
> Reviewed-by: Laurent Pinchart
Thanks,
Mauro
[PATCH] media: isppreview: fix __user annotations
The 'from' variable at preview_config() expects an __user * type.
However, the logic there does:
from = *(void * __user *) ((void *)cfg + attr->config_offset);
With actually means a void pointer, pointing to a void __ user
pointer. When the first pointer is de-referenced with *(foo),
the type it returns is "void *" instead of "void __user *".
Change it to:
from = *(void __user **) ((void *)cfg + attr->config_offset);
in order to obtain, when de-referenced, a void __user pointer,
as desired.
That prevent those warnings:
drivers/media/platform/omap3isp/isppreview.c:893:45: warning: incorrect type
in initializer (different address spaces)
drivers/media/platform/omap3isp/isppreview.c:893:45:expected void
[noderef] *from
drivers/media/platform/omap3isp/isppreview.c:893:45:got void *[noderef]
drivers/media/platform/omap3isp/isppreview.c:893:47: warning: dereference of
noderef expression
Reviewed-by: Laurent Pinchart
Signed-off-by: Mauro Carvalho Chehab
diff --git a/drivers/media/platform/omap3isp/isppreview.c
b/drivers/media/platform/omap3isp/isppreview.c
index ac30a0f83780..c2ef5870b231 100644
--- a/drivers/media/platform/omap3isp/isppreview.c
+++ b/drivers/media/platform/omap3isp/isppreview.c
@@ -890,7 +890,7 @@ static int preview_config(struct isp_prev_device *prev,
params = &prev->params.params[!!(active & bit)];
if (cfg->flag & bit) {
- void __user *from = *(void * __user *)
+ void __user *from = *(void __user **)
((void *)cfg + attr->config_offset);
void *to = (void *)params + attr->param_offset;
size_t size = attr->param_size;
