linux-kernel - [PATCH AUTOSEL for 4.9 079/190] tipc: check return value of nlmsg

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Message-ID: <20180308045810.8041-79-alexander.levin@microsoft.com>
Date:   Thu, 8 Mar 2018 04:59:26 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Pan Bian <bianpan2016@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 079/190] tipc: check return value of nlmsg_new

From: Pan Bian <bianpan2016@....com>

[ Upstream commit 78302fd405769c9a9379e9adda119d533dce2eed ]

Function nlmsg_new() will return a NULL pointer if there is no enough
memory, and its return value should be checked before it is used.
However, in function tipc_nl_node_get_monitor(), the validation of the
return value of function nlmsg_new() is missed. This patch fixes the
bug.

Signed-off-by: Pan Bian <bianpan2016@....com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 net/tipc/node.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/tipc/node.c b/net/tipc/node.c
index 5b3e1ea37b6d..db8fbc076e1a 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -2094,6 +2094,8 @@ int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
 	int err;
 
 	msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!msg.skb)
+		return -ENOMEM;
 	msg.portid = info->snd_portid;
 	msg.seq = info->snd_seq;
 
-- 
2.14.1