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drm/amd: check num of link levels when update pcie param

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commit 406e8845356d18bdf3d3a23b347faf67706472ec upstream.

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@amd.com>
Acked-by: Jingwen Chen <Jingwen.Chen2@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[ Resolve minor conflicts to fix CVE-2023-52812 ]
Signed-off-by: Bin Lan <bin.lan.cn@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lin.Cao
2023-10-25 11:32:41 +08:00
committed by Greg Kroah-Hartman
parent 52c81fd0f5
commit 2f2d48b624
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0.c
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@@ -2498,6 +2498,9 @@ int smu_v13_0_update_pcie_parameters(struct smu_context *smu,
uint32_t smu_pcie_arg; uint32_t smu_pcie_arg;
int ret, i; int ret, i;
if (!num_of_levels)
return 0;
if (!amdgpu_device_pcie_dynamic_switching_supported()) { if (!amdgpu_device_pcie_dynamic_switching_supported()) {
if (pcie_table->pcie_gen[num_of_levels - 1] < pcie_gen_cap) if (pcie_table->pcie_gen[num_of_levels - 1] < pcie_gen_cap)
pcie_gen_cap = pcie_table->pcie_gen[num_of_levels - 1]; pcie_gen_cap = pcie_table->pcie_gen[num_of_levels - 1];