netlabel: fix problems with mapping removal
This patch fixes two main problems seen when removing NetLabel mappings: memory leaks and potentially extra audit noise. The memory leaks are caused by not properly free'ing the mapping's address selector struct when free'ing the entire entry as well as not properly cleaning up a temporary mapping entry when adding new address selectors to an existing entry. This patch fixes both these problems such that kmemleak reports no NetLabel associated leaks after running the SELinux test suite. The potentially extra audit noise was caused by the auditing code in netlbl_domhsh_remove_entry() being called regardless of the entry's validity. If another thread had already marked the entry as invalid, but not removed/free'd it from the list of mappings, then it was possible that an additional mapping removal audit record would be generated. This patch fixes this by returning early from the removal function when the entry was previously marked invalid. This change also ...
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3106ecb4
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