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From: Pablo Neira Ayuso <pablo@netfilter.org>
To: netfilter-devel@vger.kernel.org
Cc: kaber@trash.net
Subject: [PATCH nf] netfilter: nf_tables: fix addition/deletion of elements from commit/abort
Date: Fri, 20 Feb 2015 17:11:10 +0100	[thread overview]
Message-ID: <1424448670-4458-1-git-send-email-pablo@netfilter.org> (raw)

We have several problems in this path:

1) There is a use-after-free when removing individual elements from
   the commit path.

2) We have to uninit() the data part of the element from the abort
   path to avoid a chain refcount leak.

3) We have to check for set->flags to see if there's a mapping, instead
   of the element flags.

4) We have to check for !(flags & NFT_SET_ELEM_INTERVAL_END) to skip
   elements that are part of the interval that have no data part, so
   they don't need to be uninit().

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
This fix replaces the following two patches:

http://patchwork.ozlabs.org/patch/440781/
http://patchwork.ozlabs.org/patch/440782/

Thanks to Patrick for helping on discussing this fix!

 net/netfilter/nf_tables_api.c |   21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 199fd0f..a8c9462 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -3612,12 +3612,11 @@ static int nf_tables_commit(struct sk_buff *skb)
 						 &te->elem,
 						 NFT_MSG_DELSETELEM, 0);
 			te->set->ops->get(te->set, &te->elem);
-			te->set->ops->remove(te->set, &te->elem);
 			nft_data_uninit(&te->elem.key, NFT_DATA_VALUE);
-			if (te->elem.flags & NFT_SET_MAP) {
-				nft_data_uninit(&te->elem.data,
-						te->set->dtype);
-			}
+			if (te->set->flags & NFT_SET_MAP &&
+			    !(te->elem.flags & NFT_SET_ELEM_INTERVAL_END))
+				nft_data_uninit(&te->elem.data, te->set->dtype);
+			te->set->ops->remove(te->set, &te->elem);
 			nft_trans_destroy(trans);
 			break;
 		}
@@ -3658,7 +3657,7 @@ static int nf_tables_abort(struct sk_buff *skb)
 {
 	struct net *net = sock_net(skb->sk);
 	struct nft_trans *trans, *next;
-	struct nft_set *set;
+	struct nft_trans_elem *te;
 
 	list_for_each_entry_safe(trans, next, &net->nft.commit_list, list) {
 		switch (trans->msg_type) {
@@ -3719,9 +3718,13 @@ static int nf_tables_abort(struct sk_buff *skb)
 			break;
 		case NFT_MSG_NEWSETELEM:
 			nft_trans_elem_set(trans)->nelems--;
-			set = nft_trans_elem_set(trans);
-			set->ops->get(set, &nft_trans_elem(trans));
-			set->ops->remove(set, &nft_trans_elem(trans));
+			te = (struct nft_trans_elem *)trans->data;
+			te->set->ops->get(te->set, &te->elem);
+			nft_data_uninit(&te->elem.key, NFT_DATA_VALUE);
+			if (te->set->flags & NFT_SET_MAP &&
+			    !(te->elem.flags & NFT_SET_ELEM_INTERVAL_END))
+				nft_data_uninit(&te->elem.data, te->set->dtype);
+			te->set->ops->remove(te->set, &te->elem);
 			nft_trans_destroy(trans);
 			break;
 		case NFT_MSG_DELSETELEM:
-- 
1.7.10.4


             reply	other threads:[~2015-02-20 16:07 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-20 16:11 Pablo Neira Ayuso [this message]
2015-02-21 10:39 ` [PATCH nf] netfilter: nf_tables: fix addition/deletion of elements from commit/abort Patrick McHardy
2015-02-24 13:53   ` Pablo Neira Ayuso
2015-02-24 14:39     ` Patrick McHardy
2015-02-24 18:53       ` Pablo Neira Ayuso

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