2021-03-04 06:28:34

by Colin King

Subject: [PATCH][next] drm/amd/display: fix the return of the uninitialized value in ret

From: Colin Ian King <[email protected]>

Currently if stream->signal is neither SIGNAL_TYPE_DISPLAY_PORT_MST or
SIGNAL_TYPE_DISPLAY_PORT then variable ret is uninitialized and this is
checked for > 0 at the end of the function. Ret should be initialized,
I believe setting it to zero is a correct default.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: bd0c064c161c ("drm/amd/display: Add return code instead of boolean for future use")
Signed-off-by: Colin Ian King <[email protected]>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index 5159399f8239..5750818db8f6 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -530,7 +530,7 @@ bool dm_helpers_dp_write_dsc_enable(
{
uint8_t enable_dsc = enable ? 1 : 0;
struct amdgpu_dm_connector *aconnector;
- uint8_t ret;
+ uint8_t ret = 0;

if (!stream)
return false;
--
2.30.0

2021-03-04 06:32:05

by Harry Wentland

Subject: Re: [PATCH][next] drm/amd/display: fix the return of the uninitialized value in ret

On 2021-03-02 9:05 a.m., Colin King wrote:
> From: Colin Ian King <[email protected]>
>
> Currently if stream->signal is neither SIGNAL_TYPE_DISPLAY_PORT_MST or
> SIGNAL_TYPE_DISPLAY_PORT then variable ret is uninitialized and this is
> checked for > 0 at the end of the function. Ret should be initialized,
> I believe setting it to zero is a correct default.
>
> Addresses-Coverity: ("Uninitialized scalar variable")
> Fixes: bd0c064c161c ("drm/amd/display: Add return code instead of boolean for future use")
> Signed-off-by: Colin Ian King <[email protected]>

Reviewed-by: Harry Wentland <[email protected]>

Harry

> ---
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> index 5159399f8239..5750818db8f6 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> @@ -530,7 +530,7 @@ bool dm_helpers_dp_write_dsc_enable(
> {
> uint8_t enable_dsc = enable ? 1 : 0;
> struct amdgpu_dm_connector *aconnector;
> - uint8_t ret;
> + uint8_t ret = 0;
>
> if (!stream)
> return false;
>

2021-03-04 20:25:42

by Alex Deucher

Subject: Re: [PATCH][next] drm/amd/display: fix the return of the uninitialized value in ret

Applied. Thanks!

Alex

On Tue, Mar 2, 2021 at 10:03 AM Harry Wentland <[email protected]> wrote:
>
> On 2021-03-02 9:05 a.m., Colin King wrote:
> > From: Colin Ian King <[email protected]>
> >
> > Currently if stream->signal is neither SIGNAL_TYPE_DISPLAY_PORT_MST or
> > SIGNAL_TYPE_DISPLAY_PORT then variable ret is uninitialized and this is
> > checked for > 0 at the end of the function. Ret should be initialized,
> > I believe setting it to zero is a correct default.
> >
> > Addresses-Coverity: ("Uninitialized scalar variable")
> > Fixes: bd0c064c161c ("drm/amd/display: Add return code instead of boolean for future use")
> > Signed-off-by: Colin Ian King <[email protected]>
>
> Reviewed-by: Harry Wentland <[email protected]>
>
> Harry
>
> > ---
> > drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> > index 5159399f8239..5750818db8f6 100644
> > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
> > @@ -530,7 +530,7 @@ bool dm_helpers_dp_write_dsc_enable(
> > {
> > uint8_t enable_dsc = enable ? 1 : 0;
> > struct amdgpu_dm_connector *aconnector;
> > - uint8_t ret;
> > + uint8_t ret = 0;
> >
> > if (!stream)
> > return false;
> >
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