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SubjectRe: [PATCH 04/11] drm/r128: Fix undefined behavior due to shift overflowing the constant
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On 5/19/22 06:05, Daniel Vetter wrote:
> 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
>

Hi,

Will this be merged to mainline any time soonish?

thanks.

>>
>> 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
>

--
~Randy

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