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drm/amdgpu: remove cgs_acpi_method_argument member method_length

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It was redundant with data_length, and in fact set incorrectly in one case
leading to an out-of-bound read by memcpy in acpi_ut_copy_esimple_to_isimple,
reported by CONFIG_KASAN=y.

Signed-off-by: Nicolai Hähnle <Nicolai.Haehnle@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicolai Hähnle 2016-06-14 12:10:07 +02:00 committed by Alex Deucher
parent 840dd4c605
commit 8db6f83bef
2 changed files with 2 additions and 6 deletions
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7
drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
View file

@ -973,11 +973,11 @@ static int amdgpu_cgs_acpi_eval_object(struct cgs_device *cgs_device,
params->integer.value = argument->value;
break;
case ACPI_TYPE_STRING:
params->string.length = argument->method_length;
params->string.length = argument->data_length;
params->string.pointer = argument->pointer;
break;
case ACPI_TYPE_BUFFER:
params->buffer.length = argument->method_length;
params->buffer.length = argument->data_length;
params->buffer.pointer = argument->pointer;
break;
default:
@ -1080,17 +1080,14 @@ int amdgpu_cgs_call_acpi_method(struct cgs_device *cgs_device,
struct cgs_acpi_method_info info = {0};
acpi_input[0].type = CGS_ACPI_TYPE_INTEGER;
acpi_input[0].method_length = sizeof(uint32_t);
acpi_input[0].data_length = sizeof(uint32_t);
acpi_input[0].value = acpi_function;
acpi_input[1].type = CGS_ACPI_TYPE_BUFFER;
acpi_input[1].method_length = CGS_ACPI_MAX_BUFFER_SIZE;
acpi_input[1].data_length = input_size;
acpi_input[1].pointer = pinput;
acpi_output.type = CGS_ACPI_TYPE_BUFFER;
acpi_output.method_length = CGS_ACPI_MAX_BUFFER_SIZE;
acpi_output.data_length = output_size;
acpi_output.pointer = poutput;

1
drivers/gpu/drm/amd/include/cgs_common.h
View file

@ -189,7 +189,6 @@ typedef unsigned long cgs_handle_t;
struct cgs_acpi_method_argument {
uint32_t type;
uint32_t method_length;
uint32_t data_length;
union{
uint32_t value;