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authorGuillaume Nault <g.nault@alphalink.fr>2017-08-25 17:22:17 +0300
committerDavid S. Miller <davem@davemloft.net>2017-08-28 21:28:33 +0300
commit9ee369a405c57613d7c83a3967780c3e30c52ecc (patch)
tree9b11954e5446349cf84b7d1eedcf939fe74bb5f1 /net/l2tp
parent4c22868264516fe0c42817a87f37efb44254e7a9 (diff)
downloadlinux-9ee369a405c57613d7c83a3967780c3e30c52ecc.tar.xz
l2tp: initialise session's refcount before making it reachable
Sessions must be fully initialised before calling l2tp_session_add_to_tunnel(). Otherwise, there's a short time frame where partially initialised sessions can be accessed by external users. Fixes: dbdbc73b4478 ("l2tp: fix duplicate session creation") Signed-off-by: Guillaume Nault <g.nault@alphalink.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/l2tp')
-rw-r--r--net/l2tp/l2tp_core.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
index b0c2d4ae781d..f363669eae47 100644
--- a/net/l2tp/l2tp_core.c
+++ b/net/l2tp/l2tp_core.c
@@ -1844,6 +1844,8 @@ struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunn
l2tp_session_set_header_len(session, tunnel->version);
+ refcount_set(&session->ref_count, 1);
+
err = l2tp_session_add_to_tunnel(tunnel, session);
if (err) {
kfree(session);
@@ -1851,10 +1853,6 @@ struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunn
return ERR_PTR(err);
}
- /* Bump the reference count. The session context is deleted
- * only when this drops to zero.
- */
- refcount_set(&session->ref_count, 1);
l2tp_tunnel_inc_refcount(tunnel);
/* Ensure tunnel socket isn't deleted */