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I found two occurences of NULL pointer dereferences when fuzzing validns with American Fuzzy Lop.
With the above input, the following call to strlen(3) in rr.c L137 results in a NULL pointer dereference because 's' ends up being NULL:
With the above input, the following call to strcasecmp(3) in rr.c L788 results in a NULL pointer dereference because 'rr->next_domain' ends up being NULL: