2019-05-29 14:31:10

by Colin King

Subject: [PATCH][next] drm/i915: fix uninitialized variable 'mask'

From: Colin Ian King <[email protected]>

Currently mask is not initialized and so data is being bit-wise or'd into
a garbage value. Fix this by inintializing mask to zero.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: 1ac159e23c2c ("drm/i915: Expand subslice mask")
Signed-off-by: Colin Ian King <[email protected]>
---
drivers/gpu/drm/i915/gt/intel_sseu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_sseu.c b/drivers/gpu/drm/i915/gt/intel_sseu.c
index 763b811f2c9d..5a89672d98a2 100644
--- a/drivers/gpu/drm/i915/gt/intel_sseu.c
+++ b/drivers/gpu/drm/i915/gt/intel_sseu.c
@@ -41,7 +41,7 @@ void intel_sseu_copy_subslices(const struct sseu_dev_info *sseu, int slice,
u32 intel_sseu_get_subslices(const struct sseu_dev_info *sseu, u8 slice)
{
int i, offset = slice * sseu->ss_stride;
- u32 mask;
+ u32 mask = 0;

GEM_BUG_ON(slice >= sseu->max_slices);

--
2.20.1

2019-05-29 15:04:05

by Jani Nikula

Subject: Re: [PATCH][next] drm/i915: fix uninitialized variable 'mask'

On Wed, 29 May 2019, Colin King <[email protected]> wrote:
> From: Colin Ian King <[email protected]>
>
> Currently mask is not initialized and so data is being bit-wise or'd into
> a garbage value. Fix this by inintializing mask to zero.
>
> Addresses-Coverity: ("Uninitialized scalar variable")
> Fixes: 1ac159e23c2c ("drm/i915: Expand subslice mask")

This was already reverted for other reasons. Need to be fixed on the
next round. For future reference, please Cc: author and reviewers of the
referenced commit.

BR,
Jani.

> Signed-off-by: Colin Ian King <[email protected]>
> ---
> drivers/gpu/drm/i915/gt/intel_sseu.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/intel_sseu.c b/drivers/gpu/drm/i915/gt/intel_sseu.c
> index 763b811f2c9d..5a89672d98a2 100644
> --- a/drivers/gpu/drm/i915/gt/intel_sseu.c
> +++ b/drivers/gpu/drm/i915/gt/intel_sseu.c
> @@ -41,7 +41,7 @@ void intel_sseu_copy_subslices(const struct sseu_dev_info *sseu, int slice,
> u32 intel_sseu_get_subslices(const struct sseu_dev_info *sseu, u8 slice)
> {
> int i, offset = slice * sseu->ss_stride;
> - u32 mask;
> + u32 mask = 0;
>
> GEM_BUG_ON(slice >= sseu->max_slices);

--
Jani Nikula, Intel Open Source Graphics Center