netfilter: ebtables: don't attempt to allocate 0-sized compat array

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commit 3f1e53abff upstream.

Dmitry reports 32bit ebtables on 64bit kernel got broken by
a recent change that returns -EINVAL when ruleset has no entries.

ebtables however only counts user-defined chains, so for the
initial table nentries will be 0.

Don't try to allocate the compat array in this case, as no user
defined rules exist no rule will need 64bit translation.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Fixes: 7d7d7e0211 ("netfilter: compat: reject huge allocation requests")
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Florian Westphal 2018-04-04 21:13:30 +02:00 • committed by Greg Kroah-Hartman

parent 88c43b469d

commit 725f5ae1a6

1 changed files with 6 additions and 5 deletions

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net/bridge/netfilter/ebtables.c

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