From: Pavel Emelyanov <xemul@openvz.org>
Date: Tue, 4 Dec 2007 08:45:06 +0000 (-0800)
Subject: [IPVS]: Fix sched registration race when checking for name collision.
X-Git-Tag: v2.6.24-rc5~64^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4ac63ad6c52e9cdefbcb54ec4575ab12b78b49d9;p=pandora-kernel.git

[IPVS]: Fix sched registration race when checking for name collision.

The register_ip_vs_scheduler() checks for the scheduler with the
same name under the read-locked __ip_vs_sched_lock, then drops,
takes it for writing and puts the scheduler in list.

This is racy, since we can have a race window between the lock
being re-locked for writing.

The fix is to search the scheduler with the given name right under
the write-locked __ip_vs_sched_lock.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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