tree 4abb0ff3d1dc8eb81561a46031fcdc74de035818
parent 6dfbef4145845a421e5d9301e26cbc7136d20965
author Willy Tarreau <w@1wt.eu> 1634243438 +0200
committer Willy Tarreau <w@1wt.eu> 1634244291 +0200
encoding latin1

BUG/MEDIUM: resolvers: use correct storage for the target address

The struct resolv_answer_item contains an address field of type
"sockaddr" which is only 16 bytes long, but which is used to store
either IPv4 or IPv6. Fortunately, the contents only overlap with
the "target" field that follows it and that is large enough to
absorb the extra bytes needed to store AAAA records. But this is
dangerous as just moving fields around could result in memory
corruption.

The fix uses a union and removes the casts that were used to hide
the problem.

Older versions need to be checked and possibly fixed. This needs
to be backported anyway.