6.6-stable review patch. If anyone has any objections, please let me know.
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From: Jiang Liu gerry@linux.alibaba.com
commit 1abb2648698bf10783d2236a6b4a7ca5e8021699 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c +++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c @@ -517,7 +517,8 @@ static int smu_sys_set_pp_table(void *ha 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;