From 4de13d7ed6ffdcbb34317acaa9236f121176f5f8 Mon Sep 17 00:00:00 2001
From: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Date: Thu, 3 Mar 2016 17:54:54 +0100
Subject: [PATCH] tipc: fix nullptr crash during subscription cancel
commit 4d5cfcba2f6e ('tipc: fix connection abort during subscription
cancel'), removes the check for a valid subscription before calling
tipc_nametbl_subscribe().
This will lead to a nullptr exception when we process a
subscription cancel request. For a cancel request, a null
subscription is passed to tipc_nametbl_subscribe() resulting
in exception.
In this commit, we call tipc_nametbl_subscribe() only for
a valid subscription.
Fixes: 4d5cfcba2f6e ('tipc: fix connection abort during subscription cancel')
Reported-by: Anders Widell <anders.widell@ericsson.com>
Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/tipc/subscr.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/tipc/subscr.c b/net/tipc/subscr.c
index 69ee2eeef9688..f9ff73a8d8154 100644
--- a/net/tipc/subscr.c
+++ b/net/tipc/subscr.c
@@ -296,7 +296,8 @@ static void tipc_subscrb_rcv_cb(struct net *net, int conid,
if (tipc_subscrp_create(net, (struct tipc_subscr *)buf, subscrb, &sub))
return tipc_conn_terminate(tn->topsrv, subscrb->conid);
- tipc_nametbl_subscribe(sub);
+ if (sub)
+ tipc_nametbl_subscribe(sub);
}
/* Handle one request to establish a new subscriber */
--
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