On 06/26/15 at 01:48pm, Konstantin Khlebnikov wrote:
> Hash value passed as argument into rhashtable_lookup_compare could be
> computed using different hash table than rhashtable_lookup_compare sees.
>
> This patch passes key into rhashtable_lookup_compare() instead of hash and
> compures hash value right in place using the same table as for lookup.
>
> Also it adds comment for rhashtable_hashfn and rhashtable_obj_hashfn:
> user must prevent concurrent insert/remove otherwise returned hash value
> could be invalid.
>
> Signed-off-by: Konstantin Khlebnikov <khlebni...@yandex-team.ru>
> Fixes: e341694e3eb5 ("netlink: Convert netlink_lookup() to use RCU protected
> hash table")
> Link: http://lkml.kernel.org/r/20150514042151.ga5...@gondor.apana.org.au
> Cc: Stable <sta...@vger.kernel.org> (v3.17 .. v3.19)
Nice catch.
For reference, this is a partial cherry pick of
8d24c0b43125e ("rhashtable: Do hashing inside of rhashtable_lookup_compare()")
nft_hash is not affected as it doesn't use the lookup API until 4.0.
Acked-by: Thomas Graf <tg...@suug.ch>
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