commit 7d863c0181064b08fa6b3816522551084fd91af5
author Maxim Dounin <mdounin@mdounin.ru> Mon May 14 09:13:45 2012 +0000
committer Maxim Dounin <mdounin@mdounin.ru> Mon May 14 09:13:45 2012 +0000
tree 894636d6ad982e90eb061e8b3c62a905f1a7d70e
parent 0e3b423dc6c6653d600f4bf1687f0653be04a830

Resolver: protection from duplicate responses.

If we already had CNAME in resolver node (i.e. rn->cnlen and rn->u.cname
set), and got additional response with A record, it resulted in rn->cnlen
set and rn->u.cname overwritten by rn->u.addr (or rn->u.addrs), causing
segmentation fault later in ngx_resolver_free_node() on an attempt to free
overwritten rn->u.cname.  The opposite (i.e. CNAME got after A) might cause
similar problems as well.