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Message-Id: <1468339862-4028-4-git-send-email-pablo@netfilter.org> Date: Tue, 12 Jul 2016 18:10:59 +0200 From: Pablo Neira Ayuso <pablo@...filter.org> To: netfilter-devel@...r.kernel.org Cc: davem@...emloft.net, netdev@...r.kernel.org Subject: [PATCH 3/6] netfilter: conntrack: avoid integer overflow when resizing From: Florian Westphal <fw@...len.de> Can overflow so we might allocate very small table when bucket count is high on a 32bit platform. Note: resize is only possible from init_netns. Signed-off-by: Florian Westphal <fw@...len.de> Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org> --- net/netfilter/nf_conntrack_core.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index f204274..62c42e9 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -1601,8 +1601,15 @@ void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) unsigned int nr_slots, i; size_t sz; + if (*sizep > (UINT_MAX / sizeof(struct hlist_nulls_head))) + return NULL; + BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); + + if (nr_slots > (UINT_MAX / sizeof(struct hlist_nulls_head))) + return NULL; + sz = nr_slots * sizeof(struct hlist_nulls_head); hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, get_order(sz)); -- 2.1.4
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