ipvs: do not use dest after ip_vs_dest_put in LBLC

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commit c2a4ffb70e ("ipvs: convert lblc scheduler to rcu")
allows RCU readers to use dest after calling ip_vs_dest_put().
In the corner case it can race with ip_vs_dest_trash_expire()
which can release the dest while it is being returned to the
RCU readers as scheduling result.

To fix the problem do not allow en->dest to be replaced and
defer the ip_vs_dest_put() call by using RCU callback. Now
en->dest does not need to be RCU pointer.

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>

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Julian Anastasov 2013-09-12 11:21:08 +03:00 • committed by Simon Horman

parent bcbde4c0a7

commit 2f3d771a35

1 changed files with 31 additions and 37 deletions

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net/netfilter/ipvs/ip_vs_lblc.c

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