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vic: Use the minimum of surface/frame dimensions when writing the final frame to the GPU

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Addresses possible buffer overflow behavior.
This commit is contained in:
ameerj 2021-10-10 18:44:16 -04:00
parent 4fbec776d6
commit f346b04d12
1 changed files with 15 additions and 16 deletions
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31
src/video_core/command_classes/vic.cpp
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@ -32,7 +32,7 @@ enum class VideoPixelFormat : u64_le {
RGBA8 = 0x1f,
BGRA8 = 0x20,
RGBX8 = 0x23,
Yuv420 = 0x44,
YUV420 = 0x44,
};
} // Anonymous namespace
@ -88,12 +88,10 @@ void Vic::Execute() {
const u64 surface_width = config.surface_width_minus1 + 1;
const u64 surface_height = config.surface_height_minus1 + 1;
if (static_cast<u64>(frame->width) != surface_width ||
static_cast<u64>(frame->height) > surface_height) {
static_cast<u64>(frame->height) != surface_height) {
// TODO: Properly support multiple video streams with differing frame dimensions
LOG_WARNING(Debug,
"Frame dimensions {}x{} can't be safely decoded into surface dimensions {}x{}",
LOG_WARNING(Service_NVDRV, "Frame dimensions {}x{} don't match surface dimensions {}x{}",
frame->width, frame->height, surface_width, surface_height);
return;
}
switch (config.pixel_format) {
case VideoPixelFormat::RGBA8:
@ -101,7 +99,7 @@ void Vic::Execute() {
case VideoPixelFormat::RGBX8:
WriteRGBFrame(frame, config);
break;
case VideoPixelFormat::Yuv420:
case VideoPixelFormat::YUV420:
WriteYUVFrame(frame, config);
break;
default:
@ -136,21 +134,20 @@ void Vic::WriteRGBFrame(const AVFrame* frame, const VicConfig& config) {
scaler_height = frame->height;
converted_frame_buffer.reset();
}
// Get Converted frame
const u32 width = static_cast<u32>(frame->width);
const u32 height = static_cast<u32>(frame->height);
const std::size_t linear_size = width * height * 4;
// Only allocate frame_buffer once per stream, as the size is not expected to change
if (!converted_frame_buffer) {
converted_frame_buffer = AVMallocPtr{static_cast<u8*>(av_malloc(linear_size)), av_free};
const size_t frame_size = frame->width * frame->height * 4;
converted_frame_buffer = AVMallocPtr{static_cast<u8*>(av_malloc(frame_size)), av_free};
}
const std::array<int, 4> converted_stride{frame->width * 4, frame->height * 4, 0, 0};
u8* const converted_frame_buf_addr{converted_frame_buffer.get()};
sws_scale(scaler_ctx, frame->data, frame->linesize, 0, frame->height, &converted_frame_buf_addr,
converted_stride.data());
// Use the minimum of surface/frame dimensions to avoid buffer overflow.
const u32 surface_width = static_cast<u32>(config.surface_width_minus1) + 1;
const u32 surface_height = static_cast<u32>(config.surface_height_minus1) + 1;
const u32 width = std::min(surface_width, static_cast<u32>(frame->width));
const u32 height = std::min(surface_height, static_cast<u32>(frame->height));
const u32 blk_kind = static_cast<u32>(config.block_linear_kind);
if (blk_kind != 0) {
// swizzle pitch linear to block linear
@ -158,11 +155,12 @@ void Vic::WriteRGBFrame(const AVFrame* frame, const VicConfig& config) {
const auto size = Texture::CalculateSize(true, 4, width, height, 1, block_height, 0);
luma_buffer.resize(size);
Texture::SwizzleSubrect(width, height, width * 4, width, 4, luma_buffer.data(),
converted_frame_buffer.get(), block_height, 0, 0);
converted_frame_buf_addr, block_height, 0, 0);
gpu.MemoryManager().WriteBlock(output_surface_luma_address, luma_buffer.data(), size);
} else {
// send pitch linear frame
const size_t linear_size = width * height * 4;
gpu.MemoryManager().WriteBlock(output_surface_luma_address, converted_frame_buf_addr,
linear_size);
}
@ -173,9 +171,10 @@ void Vic::WriteYUVFrame(const AVFrame* frame, const VicConfig& config) {
const std::size_t surface_width = config.surface_width_minus1 + 1;
const std::size_t surface_height = config.surface_height_minus1 + 1;
const std::size_t aligned_width = (surface_width + 0xff) & ~0xffUL;
// Use the minimum of surface/frame dimensions to avoid buffer overflow.
const auto frame_width = std::min(surface_width, static_cast<size_t>(frame->width));
const auto frame_height = std::min(surface_height, static_cast<size_t>(frame->height));
const std::size_t aligned_width = (surface_width + 0xff) & ~0xffUL;
const auto stride = static_cast<size_t>(frame->linesize[0]);