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authorGuillaume Nault <g.nault@alphalink.fr>2018-04-12 20:50:33 +0200
committerDavid S. Miller <davem@davemloft.net>2018-04-13 12:17:26 -0400
commit5846c131c39b6d0add36ec19dc8650700690f930 (patch)
treed8bbddb871da06b66202ebaf67527dcb3267f19b /net/l2tp/l2tp_core.h
parent9267c430c6b6f4c0120e3c6bb847313d633f02a6 (diff)
downloadlinux-5846c131c39b6d0add36ec19dc8650700690f930.tar.bz2
l2tp: hold reference on tunnels in netlink dumps
l2tp_tunnel_find_nth() is unsafe: no reference is held on the returned tunnel, therefore it can be freed whenever the caller uses it. This patch defines l2tp_tunnel_get_nth() which works similarly, but also takes a reference on the returned tunnel. The caller then has to drop it after it stops using the tunnel. Convert netlink dumps to make them safe against concurrent tunnel deletion. Fixes: 309795f4bec2 ("l2tp: Add netlink control API for L2TP") Signed-off-by: Guillaume Nault <g.nault@alphalink.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/l2tp/l2tp_core.h')
-rw-r--r--net/l2tp/l2tp_core.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/l2tp/l2tp_core.h b/net/l2tp/l2tp_core.h
index ba33cbec71eb..e4896413b2b6 100644
--- a/net/l2tp/l2tp_core.h
+++ b/net/l2tp/l2tp_core.h
@@ -212,6 +212,8 @@ static inline void *l2tp_session_priv(struct l2tp_session *session)
}
struct l2tp_tunnel *l2tp_tunnel_get(const struct net *net, u32 tunnel_id);
+struct l2tp_tunnel *l2tp_tunnel_get_nth(const struct net *net, int nth);
+
void l2tp_tunnel_free(struct l2tp_tunnel *tunnel);
struct l2tp_session *l2tp_session_get(const struct net *net,