From: Patrick McHardy <kaber@xxxxxxxxx> [ upstream commit 9889840f5988ecfd43b00c9abb83c1804e21406b ] Check that the space required for the expressions doesn't exceed the size of the dlen field, which would lead to the iterators crashing. Cc: <stable@xxxxxxxxxxxxxxx> # 3.18.x Cc: <stable@xxxxxxxxxxxxxxx> # 3.19.x Signed-off-by: Patrick McHardy <kaber@xxxxxxxxx> Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx> --- net/netfilter/nf_tables_api.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 6fb532b..7baafd5 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -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]); -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
