[GitHub] [apr] gmbeard opened a new pull request, #40 : dso: Check for NULL handle in apr_dso_sym

gmbeard opened a new pull request, #40:
URL: https://github.com/apache/apr/pull/40

   The voidlinux package for **apr** on musl fails the `test_unload_library` test in `testdso.c` without this `NULL` check. The test unloads the dso and then immediately tries to read a symbol from the unloaded dso, and assumes this fails. I found it was actually succeeding to read the symbol. Maybe musl's `dlsym()` function assumes you won't pass it a `NULL` handle, and this test is invoking some UB.
   


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