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authorPablo Neira Ayuso <pablo@netfilter.org>2014-08-05 17:25:59 +0200
committerPablo Neira Ayuso <pablo@netfilter.org>2014-08-08 15:38:50 +0200
commitb88825de8545ad252c31543fef13cadf4de7a2bc (patch)
treeefda3574e66870d16818e423e4587c5f784bcfaf /net
parenta3716e70e1def691ad39e0f908fea0870ce010d9 (diff)
downloadlinux-b88825de8545ad252c31543fef13cadf4de7a2bc.tar.bz2
netfilter: nf_tables: don't update chain with unset counters
Fix possible replacement of the per-cpu chain counters by null pointer when updating an existing chain in the commit path. Reported-by: Matteo Croce <technoboy85@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/nf_tables_api.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index c6f9d3d18ed1..9aa31f11056d 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -899,6 +899,9 @@ static struct nft_stats __percpu *nft_stats_alloc(const struct nlattr *attr)
static void nft_chain_stats_replace(struct nft_base_chain *chain,
struct nft_stats __percpu *newstats)
{
+ if (newstats == NULL)
+ return;
+
if (chain->stats) {
struct nft_stats __percpu *oldstats =
nft_dereference(chain->stats);