linux-kernel - [PATCH AUTOSEL 6.6 33/40] drm/amd: check num of link levels when update pcie param

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Message-ID: <20231107121837.3759358-33-sashal@kernel.org>
Date:   Tue,  7 Nov 2023 07:16:35 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     "Lin.Cao" <lincao12@....com>, Jingwen Chen <Jingwen.Chen2@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, evan.quan@....com,
        christian.koenig@....com, Xinhui.Pan@....com, airlied@...il.com,
        daniel@...ll.ch, lijo.lazar@....com, mario.limonciello@....com,
        Hawking.Zhang@....com, guchun.chen@....com, Lyndon.Li@....com,
        bokun.zhang@....com, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.6 33/40] drm/amd: check num of link levels when update pcie param

From: "Lin.Cao" <lincao12@....com>

[ Upstream commit 406e8845356d18bdf3d3a23b347faf67706472ec ]

In SR-IOV environment, the value of pcie_table->num_of_link_levels will
be 0, and num_of_levels - 1 will cause array index out of bounds

Signed-off-by: Lin.Cao <lincao12@....com>
Acked-by: Jingwen Chen <Jingwen.Chen2@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c
index 4aeb84572e5b8..5355f621388bb 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c
@@ -2430,6 +2430,9 @@ int smu_v13_0_update_pcie_parameters(struct smu_context *smu,
 	uint32_t smu_pcie_arg;
 	int ret, i;
 
+	if (!num_of_levels)
+		return 0;
+
 	if (!(smu->adev->pm.pp_feature & PP_PCIE_DPM_MASK)) {
 		if (pcie_table->pcie_gen[num_of_levels - 1] < pcie_gen_cap)
 			pcie_gen_cap = pcie_table->pcie_gen[num_of_levels - 1];
-- 
2.42.0