From: Mikita Lipski <mlipski@amd.com>
To: "Gustavo A. R. Silva" <gustavo@embeddedor.com>,
"Harry Wentland" <harry.wentland@amd.com>,
"Leo Li" <sunpeng.li@amd.com>,
"Alex Deucher" <alexander.deucher@amd.com>,
"Christian König" <christian.koenig@amd.com>,
"David (ChunMing) Zhou" <David1.Zhou@amd.com>,
"David Airlie" <airlied@linux.ie>,
"Daniel Vetter" <daniel@ffwll.ch>,
"Mikita Lipski" <mikita.lipski@amd.com>,
"Lyude Paul" <lyude@redhat.com>,
"Nicholas Kazlauskas" <nicholas.kazlauskas@amd.com>
Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] drm/amd/display: Fix unsigned variable compared to less than zero
Date: Mon, 11 Nov 2019 12:46:32 -0500 [thread overview]
Message-ID: <b5b41653-3536-b0f0-2f49-2c010370ec99@amd.com> (raw)
In-Reply-To: <20191111172543.GA31748@embeddedor>
Thanks for catching it!
Reviewed-by: Mikita Lipski <mikita.lipski@amd.com>
On 11.11.2019 12:25, Gustavo A. R. Silva wrote:
> Currenly, the error check below on variable*vcpi_slots* is always
> false because it is a uint64_t type variable, hence, the values
> this variable can hold are never less than zero:
>
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c:
> 4870 if (dm_new_connector_state->vcpi_slots < 0) {
> 4871 DRM_DEBUG_ATOMIC("failed finding vcpi slots: %d\n", (int)dm_new_connector_stat e->vcpi_slots);
> 4872 return dm_new_connector_state->vcpi_slots;
> 4873 }
>
> Fix this by making*vcpi_slots* of int type
>
> Addresses-Coverity: 1487838 ("Unsigned compared against 0")
> Fixes: b4c578f08378 ("drm/amd/display: Add MST atomic routines")
> Signed-off-by: Gustavo A. R. Silva<gustavo@embeddedor.com>
> ---
> drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> index 6db07e9e33ab..a8fc90a927d6 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
> @@ -403,7 +403,7 @@ struct dm_connector_state {
> bool underscan_enable;
> bool freesync_capable;
> uint8_t abm_level;
> - uint64_t vcpi_slots;
> + int vcpi_slots;
> uint64_t pbn;
> };
>
> -- 2.23.0
--
Thanks,
Mikita Lipski
Software Engineer, AMD
mikita.lipski@amd.com
next prev parent reply other threads:[~2019-11-11 17:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-11 17:25 [PATCH] drm/amd/display: Fix unsigned variable compared to less than zero Gustavo A. R. Silva
2019-11-11 17:46 ` Mikita Lipski [this message]
2019-11-11 19:27 ` Gustavo A. R. Silva
2019-11-11 22:39 ` Alex Deucher
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