netfilter: ipset: fixes possible oops in mtype_resize

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[ Upstream commit 2b33d6ffa9 ]

currently mtype_resize() can cause oops

        t = ip_set_alloc(htable_size(htable_bits));
        if (!t) {
                ret = -ENOMEM;
                goto out;
        }
        t->hregion = ip_set_alloc(ahash_sizeof_regions(htable_bits));

Increased htable_bits can force htable_size() to return 0.
In own turn ip_set_alloc(0) returns not 0 but ZERO_SIZE_PTR,
so follwoing access to t->hregion should trigger an OOPS.

Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Acked-by: Jozsef Kadlecsik <kadlec@netfilter.org>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Vasily Averin 2020-12-17 11:53:40 +03:00 • committed by Greg Kroah-Hartman

parent c871060d3e

commit cc77e4a020

1 changed files with 13 additions and 9 deletions

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net/netfilter/ipset/ip_set_hash_gen.h

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