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drm/amdgpu: avoid buffer overflow attach in smu_sys_set_pp_table()

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It malicious user provides a small pptable through sysfs and then
a bigger pptable, it may cause buffer overflow attack in function
smu_sys_set_pp_table().

Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Jiang Liu <gerry@linux.alibaba.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Jiang Liu 2025-02-07 14:44:14 +08:00 committed by Alex Deucher
parent d584198a6f
commit 1abb264869
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
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@ -612,7 +612,8 @@ static int smu_sys_set_pp_table(void *handle,
return -EIO;
}
if (!smu_table->hardcode_pptable) {
if (!smu_table->hardcode_pptable || smu_table->power_play_table_size < size) {
kfree(smu_table->hardcode_pptable);
smu_table->hardcode_pptable = kzalloc(size, GFP_KERNEL);
if (!smu_table->hardcode_pptable)
return -ENOMEM;