netdev - [net 1/1] tipc: fix access of released memory

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Date:   Mon, 20 Nov 2017 21:43:03 +0100
From:   Jon Maloy <jon.maloy@...csson.com>
To:     <davem@...emloft.net>, <netdev@...r.kernel.org>
CC:     <mohan.krishna.ghanta.krishnamurthy@...csson.com>,
        <tung.q.nguyen@...tech.com.au>, <hoang.h.le@...tech.com.au>,
        <jon.maloy@...csson.com>, <canh.d.luu@...tech.com.au>,
        <ying.xue@...driver.com>, <tipc-discussion@...ts.sourceforge.net>
Subject: [net  1/1] tipc: fix access of released memory

When the function tipc_group_filter_msg() finds that a member event
indicates that the member is leaving the group, it first deletes the
member instance, and then purges the message queue being handled
by the call. But the message queue is an aggregated field in the
just deleted item, leading the purge call to access freed memory.

We fix this by swapping the order of the two actions.

Signed-off-by: Jon Maloy <jon.maloy@...csson.com>
---
 net/tipc/group.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/tipc/group.c b/net/tipc/group.c
index 7821085..12777ca 100644
--- a/net/tipc/group.c
+++ b/net/tipc/group.c
@@ -539,8 +539,8 @@ void tipc_group_filter_msg(struct tipc_group *grp, struct sk_buff_head *inputq,
 			tipc_group_proto_xmit(grp, m, GRP_ACK_MSG, xmitq);
 
 		if (leave) {
-			tipc_group_delete_member(grp, m);
 			__skb_queue_purge(defq);
+			tipc_group_delete_member(grp, m);
 			break;
 		}
 		if (!update)
-- 
2.1.4