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netfilter: nf_tables: use u32 for chain use counter

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Since 4fefee5 ("netfilter: nf_tables: allow to delete several objects
from a batch"), every new rule bumps the chain use counter. However,
this is limited to 16 bits, which means that it will overrun after
2^16 rules.

Use a u32 chain counter and check for overflows (just like we do for
table objects).

Signed-off-by: Pablo Neira Ayuso <[email protected]>
This commit is contained in:
Pablo Neira Ayuso 2014-06-10 10:53:01 +02:00
commit a0a7379e16
2 changed files with 6 additions and 3 deletions
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3
net/netfilter/nf_tables_api.c
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@ -1730,6 +1730,9 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
if (!create || nlh->nlmsg_flags & NLM_F_REPLACE)
return -EINVAL;
handle = nf_tables_alloc_handle(table);
if (chain->use == UINT_MAX)
return -EOVERFLOW;
}
if (nla[NFTA_RULE_POSITION]) {