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[5/7] netfilter: nf_tables: check for overflow of rule dlen field

Message ID 1425588529-4573-6-git-send-email-pablo@netfilter.org
State Accepted
Delegated to: Pablo Neira
Headers show

Commit Message

Pablo Neira Ayuso March 5, 2015, 8:48 p.m. UTC 
From: Patrick McHardy <kaber@trash.net>

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>
---
 net/netfilter/nf_tables_api.c |    4 ++++
 1 file changed, 4 insertions(+)
diff mbox

Patch

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]);