netdev - [net 1/1] tipc: fix missing initializer in tipc

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Date:   Thu, 12 Apr 2018 01:15:48 +0200
From:   Jon Maloy <jon.maloy@...csson.com>
To:     <davem@...emloft.net>, <netdev@...r.kernel.org>
CC:     <mohan.krishna.ghanta.krishnamurthy@...csson.com>,
        <tung.q.nguyen@...tech.com.au>, <hoang.h.le@...tech.com.au>,
        <jon.maloy@...csson.com>, <canh.d.luu@...tech.com.au>,
        <ying.xue@...driver.com>, <tipc-discussion@...ts.sourceforge.net>
Subject: [net  1/1] tipc: fix missing initializer in tipc_sendmsg()

The stack variable 'dnode' in __tipc_sendmsg() may theoretically
end up tipc_node_get_mtu() as an unitilalized variable.

We fix this by intializing the variable at declaration. We also add
a default else clause to the two conditional ones already there, so
that we never end up in the named function if the given address
type is illegal.

Reported-by: syzbot+b0975ce9355b347c1546@...kaller.appspotmail.com
Signed-off-by: Jon Maloy <jon.maloy@...csson.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 1fd1c8b..252a52ae 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1278,7 +1278,7 @@ static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
 	struct tipc_msg *hdr = &tsk->phdr;
 	struct tipc_name_seq *seq;
 	struct sk_buff_head pkts;
-	u32 dnode, dport;
+	u32 dport, dnode = 0;
 	u32 type, inst;
 	int mtu, rc;
 
@@ -1348,6 +1348,8 @@ static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
 		msg_set_destnode(hdr, dnode);
 		msg_set_destport(hdr, dest->addr.id.ref);
 		msg_set_hdr_sz(hdr, BASIC_H_SIZE);
+	} else {
+		return -EINVAL;
 	}
 
 	/* Block or return if destination link is congested */
-- 
2.1.4