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sch_cake: fix srchost/dsthost hashing mode
[ Upstream commit 86b9bbd ] When adding support for using the skb->hash value as the flow hash in CAKE, I accidentally introduced a logic error that broke the host-only isolation modes of CAKE (srchost and dsthost keywords). Specifically, the flow_hash variable should stay initialised to 0 in cake_hash() in pure host-based hashing mode. Add a check for this before using the skb->hash value as flow_hash. Fixes: b0c19ed ("sch_cake: Take advantage of skb->hash where appropriate") Reported-by: Pete Heist <pete@heistp.net> Tested-by: Pete Heist <pete@heistp.net> Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
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