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Code Issues Releases Wiki Activity

vk_blit_screen: Fix non-accelerated texture size calculation 

Addresses the potential OOB access in UnswizzleTexture.
merge-requests/60/head
ameerj 2021-08-16 14:28:10 +07:00
parent bdd617da03
commit 537c6ac8fe
2 changed files with 3 additions and 9 deletions
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4
src/video_core/renderer_vulkan/vk_blit_screen.cpp
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@ -159,11 +159,13 @@ VkSemaphore VKBlitScreen::Draw(const Tegra::FramebufferConfig& framebuffer,
const VAddr framebuffer_addr = framebuffer.address + framebuffer.offset;
const u8* const host_ptr = cpu_memory.GetPointer(framebuffer_addr);
const size_t size_bytes = GetSizeInBytes(framebuffer);
// TODO(Rodrigo): Read this from HLE
constexpr u32 block_height_log2 = 4;
const u32 bytes_per_pixel = GetBytesPerPixel(framebuffer);
const u64 size_bytes{Tegra::Texture::CalculateSize(true, bytes_per_pixel,
framebuffer.stride, framebuffer.height,
1, block_height_log2, 0)};
Tegra::Texture::UnswizzleTexture(
mapped_span.subspan(image_offset, size_bytes), std::span(host_ptr, size_bytes),
bytes_per_pixel, framebuffer.width, framebuffer.height, 1, block_height_log2, 0);

8
src/video_core/textures/decoders.cpp
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@ -63,14 +63,6 @@ void SwizzleImpl(std::span<u8> output, std::span<const u8> input, u32 width, u32
const u32 unswizzled_offset =
slice * pitch * height + line * pitch + column * BYTES_PER_PIXEL;
if (const auto offset = (TO_LINEAR ? unswizzled_offset : swizzled_offset);
offset >= input.size()) {
// TODO(Rodrigo): This is an out of bounds access that should never happen. To
// avoid crashing the emulator, break.
ASSERT_MSG(false, "offset {} exceeds input size {}!", offset, input.size());
break;
}
u8* const dst = &output[TO_LINEAR ? swizzled_offset : unswizzled_offset];
const u8* const src = &input[TO_LINEAR ? unswizzled_offset : swizzled_offset];