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tipc: fix a potental access after delete in tipc_sk_join()

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In commit d12d2e12ce "tipc: send out join messages as soon as new
member is discovered") we added a call to the function tipc_group_join()
without considering the case that the preceding tipc_sk_publish() might
have failed, and the group item already deleted.

We fix this by returning from tipc_sk_join() directly after the
failed tipc_sk_publish.

Reported-by: syzbot+e3eeae78ea88b8d6d858@syzkaller.appspotmail.com
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 2018-01-10 21:08:50 +01:00 committed by David S. Miller
parent 2c76b34898
commit febafc8455
1 changed files with 1 additions and 0 deletions
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net/tipc/socket.c
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@ -2774,6 +2774,7 @@ static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
if (rc) {
tipc_group_delete(net, grp);
tsk->group = NULL;
return rc;
}
/* Eliminate any risk that a broadcast overtakes sent JOINs */
tsk->mc_method.rcast = true;