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netfilter: nf_tables: check for overflow of rule dlen field

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Check that the space required for the expressions doesn't exceed the
size of the dlen field, which would lead to the iterators crashing.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Patrick McHardy 2015-03-03 20:04:19 +00:00 • committed by Pablo Neira Ayuso
parent 8670c3a55e
commit 9889840f59
1 changed files with 4 additions and 0 deletions
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4
net/netfilter/nf_tables_api.c
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@ -1968,6 +1968,10 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
n++;
}
}
/* Check for overflow of dlen field */
err = -EFBIG;
if (size >= 1 << 12)
goto err1;
if (nla[NFTA_RULE_USERDATA])
ulen = nla_len(nla[NFTA_RULE_USERDATA]);