netfilter: conntrack: fix calculation of next bucket number in early_drop

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commit f393808dc6 upstream.

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>

...

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Vasily Khoruzhick 2018-10-25 12:15:43 -07:00 • committed by Greg Kroah-Hartman

parent ccd35ba5eb

commit 1be1576a13

1 changed files with 8 additions and 5 deletions

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net/netfilter/nf_conntrack_core.c

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