linux-kernel - [PATCH AUTOSEL 6.3 38/44] drm/amd: Fix an out of bounds error in BIOS parser

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Message-Id: <20230501025632.3253067-38-sashal@kernel.org>
Date:   Sun, 30 Apr 2023 22:56:26 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Mario Limonciello <mario.limonciello@....com>,
        erhard_f@...lbox.org, Harry Wentland <harry.wentland@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, sunpeng.li@....com,
        Rodrigo.Siqueira@....com, christian.koenig@....com,
        Xinhui.Pan@....com, airlied@...il.com, daniel@...ll.ch,
        Charlene.Liu@....com, chiahsuan.chung@....com,
        tony.tascioglu@....com, aurabindo.pillai@....com,
        george.shen@....com, sancchen@....com, tales.aparecida@...il.com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.3 38/44] drm/amd: Fix an out of bounds error in BIOS parser

From: Mario Limonciello <mario.limonciello@....com>

[ Upstream commit d116db180decec1b21bba31d2ff495ac4d8e1b83 ]

The array is hardcoded to 8 in atomfirmware.h, but firmware provides
a bigger one sometimes. Deferencing the larger array causes an out
of bounds error.

commit 4fc1ba4aa589 ("drm/amd/display: fix array index out of bound error
in bios parser") fixed some of this, but there are two other cases
not covered by it.  Fix those as well.

Reported-by: erhard_f@...lbox.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=214853
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2473
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
Reviewed-by: Harry Wentland <harry.wentland@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c b/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c
index e381de2429fa6..ae3783a7d7f45 100644
--- a/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c
+++ b/drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c
@@ -515,11 +515,8 @@ static enum bp_result get_gpio_i2c_info(
 	info->i2c_slave_address = record->i2c_slave_addr;
 
 	/* TODO: check how to get register offset for en, Y, etc. */
-	info->gpio_info.clk_a_register_index =
-			le16_to_cpu(
-			header->gpio_pin[table_index].data_a_reg_index);
-	info->gpio_info.clk_a_shift =
-			header->gpio_pin[table_index].gpio_bitshift;
+	info->gpio_info.clk_a_register_index = le16_to_cpu(pin->data_a_reg_index);
+	info->gpio_info.clk_a_shift = pin->gpio_bitshift;
 
 	return BP_RESULT_OK;
 }
-- 
2.39.2