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authorPablo Neira Ayuso <pablo@netfilter.org>2020-12-08 18:57:02 +0100
committerPablo Neira Ayuso <pablo@netfilter.org>2020-12-08 21:53:48 +0100
commit42f1c27120906a54e73101a7d6a12f58813f6a9f (patch)
treed42c64bf7b90d5a04d75c39daffdea1991040208 /net
parent917d80d376ffbaa9725fde9e3c0282f63643f278 (diff)
netfilter: nftables: comment indirect serialization of commit_mutex with rtnl_mutex
Add an explicit comment in the code to describe the indirect serialization of the holders of the commit_mutex with the rtnl_mutex. Commit 90d2723c6d4c ("netfilter: nf_tables: do not hold reference on netdevice from preparation phase") already describes this, but a comment in this case is better for reference. Reported-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net')
-rw-r--r--net/netfilter/nf_tables_api.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index c2f59879a48d..9a080767667b 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1723,6 +1723,10 @@ static struct nft_hook *nft_netdev_hook_alloc(struct net *net,
}
nla_strlcpy(ifname, attr, IFNAMSIZ);
+ /* nf_tables_netdev_event() is called under rtnl_mutex, this is
+ * indirectly serializing all the other holders of the commit_mutex with
+ * the rtnl_mutex.
+ */
dev = __dev_get_by_name(net, ifname);
if (!dev) {
err = -ENOENT;