[lucid/fsl-imx51 CVE 09/12] tipc: use limited socket backlog CVE-2010-4251

[Andy Whitcroft]

From: Zhu Yi <yi.zhu at intel.com>

BugLink: http://bugs.launchpad.net/bugs/807462

Make tipc adapt to the limited socket backlog change.

Cc: Jon Maloy <jon.maloy at ericsson.com>
Cc: Allan Stephens <allan.stephens at windriver.com>
Signed-off-by: Zhu Yi <yi.zhu at intel.com>
Acked-by: Eric Dumazet <eric.dumazet at gmail.com>
Acked-by: Allan Stephens <allan.stephens at windriver.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit 53eecb1be5ae499d399d2923933937a9ea1a284f)

Signed-off-by: Paolo Pisati <paolo.pisati at canonical.com>
Signed-off-by: Tim Gardner <tim.gardner at canonical.com>
Signed-off-by: Andy Whitcroft <apw at canonical.com>
---
 net/tipc/socket.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 71036fb..93c97a0 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1323,8 +1323,10 @@ static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
 	if (!sock_owned_by_user(sk)) {
 		res = filter_rcv(sk, buf);
 	} else {
-		sk_add_backlog(sk, buf);
-		res = TIPC_OK;
+		if (sk_add_backlog_limited(sk, buf))
+			res = TIPC_ERR_OVERLOAD;
+		else
+			res = TIPC_OK;
 	}
 	bh_unlock_sock(sk);
 
-- 
1.7.4.1