winbindd name_to_sid cache bug

[Qiao Yang]

We found a bug in winbind. Winbind assumes Name to SID is 1-to-1 match, so when it is looking up a SID, it caches both SID-to-Name and Name-to-SID mapping. But actually a name may have old SIDs mapped to them (this happens when you migrate a user from one domain to another). A name should only be mapped to its primary SID. Attached is the patch.

Cheers,
--Qiao

St. Bernard Software
http://www.stbernard.com
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