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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Kangjie Lu <kjlu@umn.edu>,
        "David S . Miller" <davem@davemloft.net>,
        Sasha Levin <sashal@kernel.org>, netdev@vger.kernel.org,
        tipc-discussion@lists.sourceforge.net
Subject: [PATCH AUTOSEL 4.19 149/219] tipc: fix a missing check of genlmsg_put
Date:   Fri, 22 Nov 2019 00:48:01 -0500
Message-Id: <20191122054911.1750-142-sashal@kernel.org>
In-Reply-To: <20191122054911.1750-1-sashal@kernel.org>
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From: Kangjie Lu <kjlu@umn.edu>

[ Upstream commit 46273cf7e009231d2b6bc10a926e82b8928a9fb2 ]

genlmsg_put could fail. The fix inserts a check of its return value, and
if it fails, returns -EMSGSIZE.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/tipc/netlink_compat.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c
index 6494d6b5e1b24..fab0384d2b4b3 100644
--- a/net/tipc/netlink_compat.c
+++ b/net/tipc/netlink_compat.c
@@ -983,6 +983,8 @@ static int tipc_nl_compat_publ_dump(struct tipc_nl_compat_msg *msg, u32 sock)
 
 	hdr = genlmsg_put(args, 0, 0, &tipc_genl_family, NLM_F_MULTI,
 			  TIPC_NL_PUBL_GET);
+	if (!hdr)
+		return -EMSGSIZE;
 
 	nest = nla_nest_start(args, TIPC_NLA_SOCK);
 	if (!nest) {
-- 
2.20.1