| Message ID | 20211220143020.157612091@linuxfoundation.org |
|---|---|
| State | Superseded |
| Headers | show
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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, syzkaller <syzkaller@googlegroups.com>,
Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>,
Jakub Kicinski <kuba@kernel.org>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.9 05/31] net: netlink: af_netlink: Prevent empty skb by
adding a check on len.
Date: Mon, 20 Dec 2021 15:34:05 +0100
Message-Id: <20211220143020.157612091@linuxfoundation.org>
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diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index 1b70de5898c42..13d69cbd14c20 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -1804,6 +1804,11 @@ static int netlink_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) if (msg->msg_flags&MSG_OOB) return -EOPNOTSUPP; + if (len == 0) { + pr_warn_once("Zero length message leads to an empty skb\n"); + return -ENODATA; + } + err = scm_send(sock, msg, &scm, true); if (err < 0) return err;