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tipc: fix connection abort during subscription cancel

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In 'commit 7fe8097cef ("tipc: fix nullpointer bug when subscribing
to events")', we terminate the connection if the subscription
creation fails.
In the same commit, the subscription creation result was based on
the value of the subscription pointer (set in the function) instead
of the return code.

Unfortunately, the same function tipc_subscrp_create() handles
subscription cancel request. For a subscription cancellation request,
the subscription pointer cannot be set. Thus if a subscriber has
several subscriptions and cancels any of them, the connection is
terminated.

In this commit, we terminate the connection based on the return value
of tipc_subscrp_create().
Fixes: commit 7fe8097cef ("tipc: fix nullpointer bug when subscribing to events")

Reviewed-by:  Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Parthasarathy Bhuvaragan 2016-01-27 11:35:59 +01:00 committed by David S. Miller
parent 286af315d3
commit 4d5cfcba2f
1 changed files with 5 additions and 6 deletions
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11
net/tipc/subscr.c
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@ -289,15 +289,14 @@ static void tipc_subscrb_rcv_cb(struct net *net, int conid,
struct sockaddr_tipc *addr, void *usr_data,
void *buf, size_t len)
{
struct tipc_subscriber *subscriber = usr_data;
struct tipc_subscriber *subscrb = usr_data;
struct tipc_subscription *sub = NULL;
struct tipc_net *tn = net_generic(net, tipc_net_id);
tipc_subscrp_create(net, (struct tipc_subscr *)buf, subscriber, &sub);
if (sub)
tipc_nametbl_subscribe(sub);
else
tipc_conn_terminate(tn->topsrv, subscriber->conid);
if (tipc_subscrp_create(net, (struct tipc_subscr *)buf, subscrb, &sub))
return tipc_conn_terminate(tn->topsrv, subscrb->conid);
tipc_nametbl_subscribe(sub);
}
/* Handle one request to establish a new subscriber */