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netfilter: nf_tables: fix oops when deleting a chain with references 

The following commands trigger an oops:

 # nft -i
 nft> add table filter
 nft> add chain filter input { type filter hook input priority 0; }
 nft> add chain filter test
 nft> add rule filter input jump test
 nft> delete chain filter test

We need to check the chain use counter before allowing destruction since
we might have references from sets or jump rules.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=69341
Reported-by: Matthew Ife <deleriux1@gmail.com>
Tested-by: Matthew Ife <deleriux1@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Patrick McHardy 2014-01-25 08:04:07 +00:00 committed by Pablo Neira Ayuso
parent 2a53bfb3e0
commit 3dd7279fb6
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nf_tables_api.c
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@ -1045,7 +1045,7 @@ static int nf_tables_delchain(struct sock *nlsk, struct sk_buff *skb,
if (IS_ERR(chain)) if (IS_ERR(chain))
return PTR_ERR(chain); return PTR_ERR(chain);
if (!list_empty(&chain->rules)) if (!list_empty(&chain->rules) || chain->use > 0)
return -EBUSY; return -EBUSY;
list_del(&chain->list); list_del(&chain->list);