lkml.org 
[lkml]   [2022]   [May]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 04/11] drm/r128: Fix undefined behavior due to shift overflowing the constant
On Mon, Apr 25, 2022 at 11:46:53AM -0700, Randy Dunlap wrote:
>
>
> On 4/5/22 08:15, Borislav Petkov wrote:
> > From: Borislav Petkov <bp@suse.de>
> >
> > Fix:
> >
> > drivers/gpu/drm/r128/r128_cce.c: In function ‘r128_do_init_cce’:
> > drivers/gpu/drm/r128/r128_cce.c:417:2: error: case label does not reduce to an integer constant
> > case R128_PM4_64BM_64VCBM_64INDBM:
> > ^~~~
> > drivers/gpu/drm/r128/r128_cce.c:418:2: error: case label does not reduce to an integer constant
> > case R128_PM4_64PIO_64VCPIO_64INDPIO:
> > ^~~~
> >
> > See https://lore.kernel.org/r/YkwQ6%2BtIH8GQpuct@zn.tnic for the gory
> > details as to why it triggers with older gccs only.
> >
> > Signed-off-by: Borislav Petkov <bp@suse.de>
> > Cc: David Airlie <airlied@linux.ie>
> > Cc: Daniel Vetter <daniel@ffwll.ch>
> > Cc: Alex Deucher <alexander.deucher@amd.com>
> > Cc: dri-devel@lists.freedesktop.org
>
> Reviewed-by: Randy Dunlap <rdunlap@infradead.org>

Pushed to drm-misc-next, thanks for patch&review.
-Daniel

>
> Thanks.
>
> > ---
> > drivers/gpu/drm/r128/r128_drv.h | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/r128/r128_drv.h b/drivers/gpu/drm/r128/r128_drv.h
> > index 2e1bc01aa5c9..970e192b0d51 100644
> > --- a/drivers/gpu/drm/r128/r128_drv.h
> > +++ b/drivers/gpu/drm/r128/r128_drv.h
> > @@ -300,8 +300,8 @@ extern long r128_compat_ioctl(struct file *filp, unsigned int cmd,
> > # define R128_PM4_64PIO_128INDBM (5 << 28)
> > # define R128_PM4_64BM_128INDBM (6 << 28)
> > # define R128_PM4_64PIO_64VCBM_64INDBM (7 << 28)
> > -# define R128_PM4_64BM_64VCBM_64INDBM (8 << 28)
> > -# define R128_PM4_64PIO_64VCPIO_64INDPIO (15 << 28)
> > +# define R128_PM4_64BM_64VCBM_64INDBM (8U << 28)
> > +# define R128_PM4_64PIO_64VCPIO_64INDPIO (15U << 28)
> > # define R128_PM4_BUFFER_CNTL_NOUPDATE (1 << 27)
> >
> > #define R128_PM4_BUFFER_WM_CNTL 0x0708
>
> --
> ~Randy

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

\
 
 \ /
  Last update: 2022-05-19 15:06    [W:1.586 / U:0.008 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site