[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20240925113641.1297102-140-sashal@kernel.org>
Date: Wed, 25 Sep 2024 07:26:01 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
stable@...r.kernel.org
Cc: Srinivasan Shanmugam <srinivasan.shanmugam@....com>,
Tom Chung <chiahsuan.chung@....com>,
Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
Roman Li <roman.li@....com>,
Alex Hung <alex.hung@....com>,
Aurabindo Pillai <aurabindo.pillai@....com>,
Harry Wentland <harry.wentland@....com>,
Hamza Mahfooz <hamza.mahfooz@....com>,
Alex Deucher <alexander.deucher@....com>,
Sasha Levin <sashal@...nel.org>,
sunpeng.li@....com,
christian.koenig@....com,
Xinhui.Pan@....com,
airlied@...il.com,
daniel@...ll.ch,
alvin.lee2@....com,
samson.tam@....com,
wenjing.liu@....com,
dillon.varone@....com,
yi-lchen@....com,
amd-gfx@...ts.freedesktop.org,
dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.11 140/244] drm/amd/display: Add NULL check for clk_mgr in dcn32_init_hw
From: Srinivasan Shanmugam <srinivasan.shanmugam@....com>
[ Upstream commit c395fd47d1565bd67671f45cca281b3acc2c31ef ]
This commit addresses a potential null pointer dereference issue in the
`dcn32_init_hw` function. The issue could occur when `dc->clk_mgr` is
null.
The fix adds a check to ensure `dc->clk_mgr` is not null before
accessing its functions. This prevents a potential null pointer
dereference.
Reported by smatch:
drivers/gpu/drm/amd/amdgpu/../display/dc/hwss/dcn32/dcn32_hwseq.c:961 dcn32_init_hw() error: we previously assumed 'dc->clk_mgr' could be null (see line 782)
Cc: Tom Chung <chiahsuan.chung@....com>
Cc: Rodrigo Siqueira <Rodrigo.Siqueira@....com>
Cc: Roman Li <roman.li@....com>
Cc: Alex Hung <alex.hung@....com>
Cc: Aurabindo Pillai <aurabindo.pillai@....com>
Cc: Harry Wentland <harry.wentland@....com>
Cc: Hamza Mahfooz <hamza.mahfooz@....com>
Signed-off-by: Srinivasan Shanmugam <srinivasan.shanmugam@....com>
Reviewed-by: Alex Hung <alex.hung@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c b/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c
index 05d8f81daa064..39fd3f58886c5 100644
--- a/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c
+++ b/drivers/gpu/drm/amd/display/dc/hwss/dcn32/dcn32_hwseq.c
@@ -779,7 +779,7 @@ void dcn32_init_hw(struct dc *dc)
uint32_t backlight = MAX_BACKLIGHT_LEVEL;
uint32_t user_level = MAX_BACKLIGHT_LEVEL;
- if (dc->clk_mgr && dc->clk_mgr->funcs->init_clocks)
+ if (dc->clk_mgr && dc->clk_mgr->funcs && dc->clk_mgr->funcs->init_clocks)
dc->clk_mgr->funcs->init_clocks(dc->clk_mgr);
// Initialize the dccg
@@ -958,10 +958,11 @@ void dcn32_init_hw(struct dc *dc)
if (!dcb->funcs->is_accelerated_mode(dcb) && dc->res_pool->hubbub->funcs->init_watermarks)
dc->res_pool->hubbub->funcs->init_watermarks(dc->res_pool->hubbub);
- if (dc->clk_mgr->funcs->notify_wm_ranges)
+ if (dc->clk_mgr && dc->clk_mgr->funcs && dc->clk_mgr->funcs->notify_wm_ranges)
dc->clk_mgr->funcs->notify_wm_ranges(dc->clk_mgr);
- if (dc->clk_mgr->funcs->set_hard_max_memclk && !dc->clk_mgr->dc_mode_softmax_enabled)
+ if (dc->clk_mgr && dc->clk_mgr->funcs && dc->clk_mgr->funcs->set_hard_max_memclk &&
+ !dc->clk_mgr->dc_mode_softmax_enabled)
dc->clk_mgr->funcs->set_hard_max_memclk(dc->clk_mgr);
if (dc->res_pool->hubbub->funcs->force_pstate_change_control)
--
2.43.0
Powered by blists - more mailing lists