[Samba] winbind bug - possible overflow

[Jeremy Allison]

On Tue, Jun 16, 2015 at 02:21:25PM +0200, Lukas Hejtmanek wrote:
> Hello,
> 
> I'm facing a bug with winbind. If I request groups for particular domain user,
> winbind cache gets corrupted. My winbind version is 4.1.12-23.el7_1 (Centos
> 7.1, x86_64).
> 
> 1) this is correct UID to SID mapping:
> wbinfo -U 100152
> S-1-5-21-3451901064-902568176-4053310204-180212
> 
> 2) I request groups info for a user:
> id -G -n 209459
> [reply with 33 groups]
> 
> 3) I request UID to SID mapping again:
> wbinfo -U 100152
> S-1-5-21-3135676852-3361659551-265282358-180212
> 
> and it is different. So it looks like corruption somewhere. Before I start to
> debug, is this a known problem possibly fixed in winbind 4.2.x version?

Not that I know of. Can you run winbindd under valgrind ?
Should help debug this.