[libvirt] [PATCH] lxc: fix veth off by 1 error

Daniel P. Berrange berrange at redhat.com
Wed Apr 8 10:20:29 UTC 2009

On Tue, Apr 07, 2009 at 04:21:39PM -0500, Serge E. Hallyn wrote:
> When not specifying a target for veth device, veth.c:getFreeVethName()
> is supposed to scan for unused veth devices in /sys/class/net.
> However, when it finds one, it bumps the index by one before
> returning it.
> So, if you have one container running, veth0 is passed into
> the container, veth1 is taken and still sitting in /sys/class/net.
> When you now start a second container, getFreeVethName() finds
> veth0 is unused, but returns 1.  Now container creation dies
> becuase /sys/class/net/veth1 exists.


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