Messages in this thread | | | Date | Mon, 25 Apr 2022 11:46:53 -0700 | Subject | Re: [PATCH 04/11] drm/r128: Fix undefined behavior due to shift overflowing the constant | From | Randy Dunlap <> |
| |
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>
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
| |