[ryao]

If you use secure string functions, you can generally avoid buffer overflows in C. The problem is that not everyone does. That said, exploiting buffer overflows in programs whose source code and binaries are not public is very difficult. It likely can be done, but most people would likely go after easier targets. If you deploy AddressSanitizer in production, you can get the program to terminate whenever a buffer overflows occurs, at the expense of additional overhead when there is no buffer overflow.

Memory leaks are considered a feature in short lived programs, since not freeing memory in favor of relying on the kernel to free it at program exit lets them run faster.