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Message-ID: <20240925115823.1303019-152-sashal@kernel.org>
Date: Wed, 25 Sep 2024 07:52:51 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Alex Hung <alex.hung@....com>,
Rodrigo Siqueira <rodrigo.siqueira@....com>,
Jerry Zuo <jerry.zuo@....com>,
Daniel Wheeler <daniel.wheeler@....com>,
Alex Deucher <alexander.deucher@....com>,
Sasha Levin <sashal@...nel.org>,
harry.wentland@....com,
sunpeng.li@....com,
Rodrigo.Siqueira@....com,
christian.koenig@....com,
Xinhui.Pan@....com,
airlied@...il.com,
daniel@...ll.ch,
amd-gfx@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.10 152/197] drm/amd/display: Check link_res->hpo_dp_link_enc before using it
From: Alex Hung <alex.hung@....com>
[ Upstream commit 0beca868cde8742240cd0038141c30482d2b7eb8 ]
[WHAT & HOW]
Functions dp_enable_link_phy and dp_disable_link_phy can pass link_res
without initializing hpo_dp_link_enc and it is necessary to check for
null before dereferencing.
This fixes 2 FORWARD_NULL issues reported by Coverity.
Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@....com>
Signed-off-by: Jerry Zuo <jerry.zuo@....com>
Signed-off-by: Alex Hung <alex.hung@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
.../gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c b/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c
index e1257404357b1..d0148f10dfc0a 100644
--- a/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/link/hwss/link_hwss_hpo_dp.c
@@ -28,6 +28,8 @@
#include "dccg.h"
#include "clk_mgr.h"
+#define DC_LOGGER link->ctx->logger
+
void set_hpo_dp_throttled_vcp_size(struct pipe_ctx *pipe_ctx,
struct fixed31_32 throttled_vcp_size)
{
@@ -124,6 +126,11 @@ void disable_hpo_dp_link_output(struct dc_link *link,
const struct link_resource *link_res,
enum signal_type signal)
{
+ if (!link_res->hpo_dp_link_enc) {
+ DC_LOG_ERROR("%s: invalid hpo_dp_link_enc\n", __func__);
+ return;
+ }
+
link_res->hpo_dp_link_enc->funcs->link_disable(link_res->hpo_dp_link_enc);
link_res->hpo_dp_link_enc->funcs->disable_link_phy(
link_res->hpo_dp_link_enc, signal);
--
2.43.0
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