Re: [PATCH] drm/i915/selftests: Fix uninitialized variable

[Gustavo A. R. Silva]

On 04/24/2018 08:22 AM, Chris Wilson wrote:

Quoting Gustavo A. R. Silva (2018-04-24 14:15:45)

There is a potential execution path in which variable err is
returned without being properly initialized previously.

Fix this by initializing variable err to 0.


err is only returned along an error path, returning 0 would not be
useful. Which path? All the error paths look correct to me.
-Chris



If the following two conditions take the false branch then the function 
returns err with a random stack value:


if (intel_has_reset_engine(i915)) {
...
}

if (intel_has_gpu_reset(i915)) {
...
}

Thanks
--
Gustavo
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[PATCH] drm/i915/selftests: Fix uninitialized variable

[Gustavo A. R. Silva]

There is a potential execution path in which variable err is
returned without being properly initialized previously.

Fix this by initializing variable err to 0.

Addresses-Coverity-ID: 1468362 ("Uninitialized scalar variable")
Fixes: f4ecfbfc32ed ("drm/i915: Check whitelist registers across resets")
Signed-off-by: Gustavo A. R. Silva 
---
 drivers/gpu/drm/i915/selftests/intel_workarounds.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/selftests/intel_workarounds.c 
b/drivers/gpu/drm/i915/selftests/intel_workarounds.c
index 5455b26..17444a3 100644
--- a/drivers/gpu/drm/i915/selftests/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/selftests/intel_workarounds.c
@@ -239,7 +239,7 @@ static int live_reset_whitelist(void *arg)
struct intel_engine_cs *engine = i915->engine[RCS];
struct i915_gpu_error *error = >gpu_error;
struct whitelist w;
-   int err;
+   int err = 0;
 
/* If we reset the gpu, we should not lose the RING_NONPRIV */
 
-- 
2.7.4

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Re: [PATCH] drm/i915/selftests: Fix uninitialized variable

[Chris Wilson]

Quoting Gustavo A. R. Silva (2018-04-24 14:30:58)
> 
> 
> On 04/24/2018 08:22 AM, Chris Wilson wrote:
> > Quoting Gustavo A. R. Silva (2018-04-24 14:15:45)
> >> There is a potential execution path in which variable err is
> >> returned without being properly initialized previously.
> >>
> >> Fix this by initializing variable err to 0.
> > 
> > err is only returned along an error path, returning 0 would not be
> > useful. Which path? All the error paths look correct to me.
> > -Chris
> > 
> 
> If the following two conditions take the false branch then the function 
> returns err with a random stack value:


It would help if I read the right function. Ok,
Reviewed-by: Chris Wilson 
-Chris
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Re: [PATCH] drm/i915/selftests: Fix uninitialized variable

[Chris Wilson]

Quoting Gustavo A. R. Silva (2018-04-24 14:15:45)
> There is a potential execution path in which variable err is
> returned without being properly initialized previously.
> 
> Fix this by initializing variable err to 0.

err is only returned along an error path, returning 0 would not be
useful. Which path? All the error paths look correct to me.
-Chris
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