netdev - [PATCH net-next] tipc: check nl sock before parsing nested attributes

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Date:	Mon, 16 May 2016 11:14:54 +0200
From:	Richard Alpe <richard.alpe@...csson.com>
To:	<netdev@...r.kernel.org>
CC:	<sploving1@...il.com>, <eric.dumazet@...il.com>,
	<tipc-discussion@...ts.sourceforge.net>,
	Richard Alpe <richard.alpe@...csson.com>
Subject: [PATCH net-next] tipc: check nl sock before parsing nested attributes

Make sure the socket for which the user is listing publication exists
before parsing the socket netlink attributes.

Prior to this patch a call without any socket caused a NULL pointer
dereference in tipc_nl_publ_dump().

Tested-and-reported-by: Baozeng Ding <sploving1@...il.com>
Signed-off-by: Richard Alpe <richard.alpe@...csson.com>
---
 net/tipc/socket.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 1262889..3b7a799 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -2853,6 +2853,9 @@ int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
 		if (err)
 			return err;
 
+		if (!attrs[TIPC_NLA_SOCK])
+			return -EINVAL;
+
 		err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
 				       attrs[TIPC_NLA_SOCK],
 				       tipc_nl_sock_policy);
-- 
2.1.4