netdev - [Patch net] tipc: check return value of __tipc_dump

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Date:   Tue, 11 Sep 2018 15:12:17 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     netdev@...r.kernel.org
Cc:     tipc-discussion@...ts.sourceforge.net,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jon Maloy <jon.maloy@...csson.com>,
        Ying Xue <ying.xue@...driver.com>
Subject: [Patch net] tipc: check return value of __tipc_dump_start()

When __tipc_dump_start() fails with running out of memory,
we have no reason to continue, especially we should avoid
calling tipc_dump_done().

Fixes: 8f5c5fcf3533 ("tipc: call start and done ops directly in __tipc_nl_compat_dumpit()")
Reported-and-tested-by: syzbot+3f8324abccfbf8c74a9f@...kaller.appspotmail.com
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/netlink_compat.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c
index 82f665728382..6376467e78f8 100644
--- a/net/tipc/netlink_compat.c
+++ b/net/tipc/netlink_compat.c
@@ -185,7 +185,10 @@ static int __tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd,
 		return -ENOMEM;
 
 	buf->sk = msg->dst_sk;
-	__tipc_dump_start(&cb, msg->net);
+	if (__tipc_dump_start(&cb, msg->net)) {
+		kfree_skb(buf);
+		return -ENOMEM;
+	}
 
 	do {
 		int rem;
-- 
2.14.4