netdev - [Patch net-next] tipc: fix a dangling pointer

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Message-Id: <20171024224449.8197-1-xiyou.wangcong@gmail.com>
Date:   Tue, 24 Oct 2017 15:44:49 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Jon Maloy <jon.maloy@...csson.com>,
        Ying Xue <ying.xue@...driver.com>
Subject: [Patch net-next] tipc: fix a dangling pointer

tsk->group is set to grp earlier, but we forget to unset it
after grp is freed.

Fixes: 75da2163dbb6 ("tipc: introduce communication groups")
Reported-by: syzkaller bot
Cc: Jon Maloy <jon.maloy@...csson.com>
Cc: Ying Xue <ying.xue@...driver.com>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
 net/tipc/socket.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index b3b72d8e9543..ea61c32f6b80 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -2756,8 +2756,10 @@ static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
 	seq.upper = seq.lower;
 	tipc_nametbl_build_group(net, grp, mreq->type, domain);
 	rc = tipc_sk_publish(tsk, mreq->scope, &seq);
-	if (rc)
+	if (rc) {
 		tipc_group_delete(net, grp);
+		tsk->group = NULL;
+	}
 
 	/* Eliminate any risk that a broadcast overtakes the sent JOIN */
 	tsk->mc_method.rcast = true;
-- 
2.13.0