f5430a3ef308f3a102899fcaf7fbece757082f2a
Let's make dns_packet_read_public_key() more generic by renaming it to dns_packet_read_memdup() (which more accurately describes what it does...). Then, patch all cases where we memdup() RR data to use this new call. This specifically checks for zero-length objects, and handles them gracefully. It will set zero length payload fields as a result. Special care should be taken to ensure that any code using this call can handle the returned allocated field to be NULL if the size is specified as 0!
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