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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2014-08-01 19:32:41 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2014-08-08 15:38:46 +0200 |
| commit | a3716e70e1def691ad39e0f908fea0870ce010d9 (patch) | |
| tree | 1d263f1e8ac0c42bbfb259dea32111ae6bf34280 /net | |
| parent | 33caee39925b887a99a2400dc5c980097c3573f9 (diff) | |
| download | lwn-a3716e70e1def691ad39e0f908fea0870ce010d9.tar.gz lwn-a3716e70e1def691ad39e0f908fea0870ce010d9.zip | |
netfilter: nf_tables: uninitialize element key/data from the commit path
This should happen once the element has been effectively released in
the commit path, not before. This fixes a possible chain refcount leak
if the transaction is aborted.
Reported-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/netfilter/nf_tables_api.c | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index b8035c2d6667..c6f9d3d18ed1 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -3139,11 +3139,6 @@ static int nft_del_setelem(struct nft_ctx *ctx, struct nft_set *set, nft_trans_elem(trans) = elem; list_add_tail(&trans->list, &ctx->net->nft.commit_list); - - nft_data_uninit(&elem.key, NFT_DATA_VALUE); - if (set->flags & NFT_SET_MAP) - nft_data_uninit(&elem.data, set->dtype); - return 0; err2: nft_data_uninit(&elem.key, desc.type); @@ -3310,7 +3305,7 @@ static int nf_tables_commit(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; /* Bump generation counter, invalidate any dump in progress */ while (++net->nft.base_seq == 0); @@ -3396,13 +3391,17 @@ static int nf_tables_commit(struct sk_buff *skb) nft_trans_destroy(trans); break; case NFT_MSG_DELSETELEM: - nf_tables_setelem_notify(&trans->ctx, - nft_trans_elem_set(trans), - &nft_trans_elem(trans), + te = (struct nft_trans_elem *)trans->data; + nf_tables_setelem_notify(&trans->ctx, te->set, + &te->elem, NFT_MSG_DELSETELEM, 0); - set = nft_trans_elem_set(trans); - set->ops->get(set, &nft_trans_elem(trans)); - set->ops->remove(set, &nft_trans_elem(trans)); + 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); + } nft_trans_destroy(trans); break; } |