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authorAllan Stephens <allan.stephens@windriver.com>2008-05-12 15:42:28 -0700
committerDavid S. Miller <davem@davemloft.net>2008-05-12 15:42:28 -0700
commit7ef43ebaa538e0cc9063cbf84593a05091bcace2 (patch)
treed2bac748f6620cc2f217672105918b2116f6c958 /net/tipc/socket.c
parent4e3e6dcb43c3669a8817cb3d0f920f91661afd98 (diff)
downloadlinux-2.6.34-ux500-7ef43ebaa538e0cc9063cbf84593a05091bcace2.tar.gz
tipc: Fix race condition when creating socket or native port
This patch eliminates the (very remote) chance of a crash resulting from a partially initialized socket or native port unexpectedly receiving a message. Now, during the creation of a socket or native port, the underlying generic port's lock is not released until all initialization required to handle incoming messages has been done. Signed-off-by: Allan Stephens <allan.stephens@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc/socket.c')
-rw-r--r--net/tipc/socket.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 230f9ca2ad6..38f48795b40 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -188,6 +188,7 @@ static int tipc_create(struct net *net, struct socket *sock, int protocol)
const struct proto_ops *ops;
socket_state state;
struct sock *sk;
+ struct tipc_port *tp_ptr;
u32 portref;
/* Validate arguments */
@@ -225,7 +226,7 @@ static int tipc_create(struct net *net, struct socket *sock, int protocol)
/* Allocate TIPC port for socket to use */
portref = tipc_createport_raw(sk, &dispatch, &wakeupdispatch,
- TIPC_LOW_IMPORTANCE);
+ TIPC_LOW_IMPORTANCE, &tp_ptr);
if (unlikely(portref == 0)) {
sk_free(sk);
return -ENOMEM;
@@ -241,6 +242,8 @@ static int tipc_create(struct net *net, struct socket *sock, int protocol)
sk->sk_backlog_rcv = backlog_rcv;
tipc_sk(sk)->p = tipc_get_port(portref);
+ spin_unlock_bh(tp_ptr->lock);
+
if (sock->state == SS_READY) {
tipc_set_portunreturnable(portref, 1);
if (sock->type == SOCK_DGRAM)