ahojnnes · GitHub

Summary of Changes

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This pull request significantly enhances the stability and reliability of the codebase by implementing a series of safety improvements. The changes focus on preventing common issues such as data corruption, out-of-bounds memory access, and resource leaks through rigorous input validation, improved exception safety, and more robust error handling mechanisms. These updates contribute to a more resilient application that can better handle unexpected or malformed data and hardware interactions.

Highlights

  • Robustness and Safety: Introduced extensive input validation and bounds checking across several modules, including consistency graphs, GPU matrices, and PLY file parsing, to prevent data corruption and out-of-bounds access.
  • Exception Safety: Improved exception handling in the LRU cache mechanism to maintain a consistent state even if load functions throw exceptions, and added explicit checks for unsigned integer underflows in memory-constrained caches.
  • CUDA Error Handling: Upgraded CUDA error reporting to use LOG(FATAL_THROW), ensuring that critical CUDA errors lead to immediate program termination and clearer error messages.
  • Resource Management: Corrected the order of resource deallocation in CUDA texture destructors and added exception handling for memory allocation during binary file reads.
Changelog
  • src/colmap/mvs/consistency_graph.cc
    • Added checks for data corruption and out-of-bounds access when initializing the consistency graph map.
  • src/colmap/mvs/cuda_texture.h
    • Corrected the order of destructor calls in CudaArrayLayeredTexture to destroy the texture object before freeing the array.
  • src/colmap/mvs/gpu_mat.h
    • Introduced checks to ensure GpuMat dimensions are positive during construction and validated file dimensions against GpuMat dimensions during file reads.
  • src/colmap/mvs/workspace.cc
    • Integrated THROW_CHECK_NOTNULL into GetBitmap, GetDepthMap, and GetNormalMap methods to ensure returned pointers are valid.
  • src/colmap/util/cache.h
    • Refactored LRUCache::Get for better exception safety by loading values before modifying cache state.
    • Added THROW_CHECK_GE to MemoryConstrainedLRUCache::Pop and UpdateNumBytes to prevent unsigned byte count underflows.
  • src/colmap/util/cache_test.cc
    • Introduced new test cases to validate the exception safety of LRUCache and the byte count consistency of MemoryConstrainedLRUCache during Pop and UpdateNumBytes operations.
  • src/colmap/util/cudacc.cc
    • Modified CUDA error handling functions (CudaSafe_Call, CudaCheck, CudaSyncAndCheck) to use LOG(FATAL_THROW) instead of LOG(ERROR) followed by exit(EXIT_FAILURE), ensuring more robust error propagation.
  • src/colmap/util/file.cc
    • Wrapped the data->resize call in ReadBinaryBlob with a try-catch block to gracefully handle potential memory allocation exceptions.
  • src/colmap/util/ply.cc
    • Defined constants for maximum PLY vertices and faces, and implemented extensive validation checks for binary PLY property byte positions to prevent out-of-bounds reads.
    • Added checks for vertex and face counts, and validated face vertex indices for both binary and ASCII PLY formats.
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