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tipc: fix access of released memory

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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@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Maloy 2017-11-20 21:43:03 +01:00 committed by David S. Miller
parent f9409e7f08
commit e0e853ac03
1 changed files with 1 additions and 1 deletions
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2
net/tipc/group.c
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@ -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)