linux-kernel - [PATCH AUTOSEL 6.6 54/83] drm/amd/display: Check BIOS images before it is used

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Message-ID: <20240801002107.3934037-54-sashal@kernel.org>
Date: Wed, 31 Jul 2024 20:18:09 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Alex Hung <alex.hung@....com>,
	Harry Wentland <harry.wentland@....com>,
	Hamza Mahfooz <hamza.mahfooz@....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,
	hersenxs.wu@....com,
	ruanjinjie@...wei.com,
	dillon.varone@....com,
	amd-gfx@...ts.freedesktop.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.6 54/83] drm/amd/display: Check BIOS images before it is used

From: Alex Hung <alex.hung@....com>

[ Upstream commit 8b0ddf19cca2a352b2a7e01d99d3ba949a99c84c ]

BIOS images may fail to load and null checks are added before they are
used.

This fixes 6 NULL_RETURNS issues reported by Coverity.

Reviewed-by: Harry Wentland <harry.wentland@....com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@....com>
Signed-off-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/bios/bios_parser.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c b/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c
index 19cd1bd844df9..684b005f564c4 100644
--- a/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c
+++ b/drivers/gpu/drm/amd/display/dc/bios/bios_parser.c
@@ -667,6 +667,9 @@ static enum bp_result get_ss_info_v3_1(
 	ss_table_header_include = ((ATOM_ASIC_INTERNAL_SS_INFO_V3 *) bios_get_image(&bp->base,
 				DATA_TABLES(ASIC_InternalSS_Info),
 				struct_size(ss_table_header_include, asSpreadSpectrum, 1)));
+	if (!ss_table_header_include)
+		return BP_RESULT_UNSUPPORTED;
+
 	table_size =
 		(le16_to_cpu(ss_table_header_include->sHeader.usStructureSize)
 				- sizeof(ATOM_COMMON_TABLE_HEADER))
@@ -1036,6 +1039,8 @@ static enum bp_result get_ss_info_from_internal_ss_info_tbl_V2_1(
 				&bp->base,
 				DATA_TABLES(ASIC_InternalSS_Info),
 				struct_size(header, asSpreadSpectrum, 1)));
+	if (!header)
+		return result;
 
 	memset(info, 0, sizeof(struct spread_spectrum_info));
 
@@ -1109,6 +1114,8 @@ static enum bp_result get_ss_info_from_ss_info_table(
 	get_atom_data_table_revision(header, &revision);
 
 	tbl = GET_IMAGE(ATOM_SPREAD_SPECTRUM_INFO, DATA_TABLES(SS_Info));
+	if (!tbl)
+		return result;
 
 	if (1 != revision.major || 2 > revision.minor)
 		return result;
@@ -1636,6 +1643,8 @@ static uint32_t get_ss_entry_number_from_ss_info_tbl(
 
 	tbl = GET_IMAGE(ATOM_SPREAD_SPECTRUM_INFO,
 			DATA_TABLES(SS_Info));
+	if (!tbl)
+		return number;
 
 	if (1 != revision.major || 2 > revision.minor)
 		return number;
@@ -1718,6 +1727,8 @@ static uint32_t get_ss_entry_number_from_internal_ss_info_tbl_v2_1(
 				&bp->base,
 				DATA_TABLES(ASIC_InternalSS_Info),
 				struct_size(header_include, asSpreadSpectrum, 1)));
+	if (!header_include)
+		return 0;
 
 	size = (le16_to_cpu(header_include->sHeader.usStructureSize)
 			- sizeof(ATOM_COMMON_TABLE_HEADER))
@@ -1756,6 +1767,9 @@ static uint32_t get_ss_entry_number_from_internal_ss_info_tbl_V3_1(
 	header_include = ((ATOM_ASIC_INTERNAL_SS_INFO_V3 *) bios_get_image(&bp->base,
 				DATA_TABLES(ASIC_InternalSS_Info),
 				struct_size(header_include, asSpreadSpectrum, 1)));
+	if (!header_include)
+		return number;
+
 	size = (le16_to_cpu(header_include->sHeader.usStructureSize) -
 			sizeof(ATOM_COMMON_TABLE_HEADER)) /
 					sizeof(ATOM_ASIC_SS_ASSIGNMENT_V3);
-- 
2.43.0