Critical error detected c0000374 – C++ dll returns pointer off allocated memory to C#

If all your code is indeed what is shown above, then I don’t see the problem. However, when I get this issue, sometimes its because malloc/new/whatever detects heap corruption, often this corruption has already occurred previously in the program, but the crash has been delayed until the next call to new/malloc.

If you read other files, or allocate or free other buffers before the above is executed and crashes, I would look there for problems. Perhaps throw a bunch of asserts anywhere you write to buffers and check the bounds and what you are writing for overruns. Sorry this isn’t a concrete answer, I do not have enough rep to leave this advice as a comment.

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