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maxwell_3d: fix out of bounds array access in size estimation

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Liam 2023-04-19 23:25:00 -04:00
parent 0cfeb2e8d7
commit eb7c2314f6
1 changed files with 6 additions and 4 deletions
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10
src/video_core/engines/maxwell_3d.cpp
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@ -4,6 +4,7 @@
#include <cstring>
#include <optional>
#include "common/assert.h"
#include "common/bit_util.h"
#include "common/scope_exit.h"
#include "common/settings.h"
#include "core/core.h"
@ -259,12 +260,13 @@ u32 Maxwell3D::GetMaxCurrentVertices() {
size_t Maxwell3D::EstimateIndexBufferSize() {
GPUVAddr start_address = regs.index_buffer.StartAddress();
GPUVAddr end_address = regs.index_buffer.EndAddress();
static constexpr std::array<size_t, 4> max_sizes = {
std::numeric_limits<u8>::max(), std::numeric_limits<u16>::max(),
std::numeric_limits<u32>::max(), std::numeric_limits<u32>::max()};
static constexpr std::array<size_t, 3> max_sizes = {std::numeric_limits<u8>::max(),
std::numeric_limits<u16>::max(),
std::numeric_limits<u32>::max()};
const size_t byte_size = regs.index_buffer.FormatSizeInBytes();
const size_t log2_byte_size = Common::Log2Ceil64(byte_size);
return std::min<size_t>(
memory_manager.GetMemoryLayoutSize(start_address, byte_size * max_sizes[byte_size]) /
memory_manager.GetMemoryLayoutSize(start_address, byte_size * max_sizes[log2_byte_size]) /
byte_size,
static_cast<size_t>(end_address - start_address));
}