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commitf393808dc6upstream. If there's no entry to drop in bucket that corresponds to the hash, early_drop() should look for it in other buckets. But since it increments hash instead of bucket number, it actually looks in the same bucket 8 times: hsize is 16k by default (14 bits) and hash is 32-bit value, so reciprocal_scale(hash, hsize) returns the same value for hash..hash+7 in most cases. Fix it by increasing bucket number instead of hash and rename _hash to bucket to avoid future confusion. Fixes:3e86638e9a("netfilter: conntrack: consider ct netns in early_drop logic") Cc: <stable@vger.kernel.org> # v4.7+ Signed-off-by: Vasily Khoruzhick <vasilykh@arista.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>