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netfilter: nf_tables: check for overflow of rule dlen field 

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>
wifi-calibration
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]);