Freeing allocated memory?

I have only one suggestion. Don't allocate memory for this, it's a waste of effort.

Using this code with gcc 3.3.3 under Cygwin works correctly for me when I call it twice. You didn't tell us what you're doing outside of these functions, so look there first, e.g. Maybe you're accidentally assigning a garbage non-NULL value to app_cfg between calls. Also, if you're not using a "big-name" compiler, there's a possibility this is a compiler bug (e.g. It may be overly optimistic at compile time and assume you'll never pass a NULL to destroy_config).

Try putting in something like.

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