From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AB8JxZp1ryFh5D4foIAEUH8dRnmwPVoN5spn9npd2HBpY+Zs2BBXfB+vKrbg8hCvkXfYXzcxtFnP ARC-Seal: i=1; a=rsa-sha256; t=1526280791; cv=none; d=google.com; s=arc-20160816; b=frLmtSSx9X6QX+ybSP+aVLOtw6zl+Jj0DC//zUVD2qxEiqyL4NuL0yRGjl3Aw4VcGp gpiX+HcUj+xzcEzHiZOnaJBFd/qEvIEBmfU3dsizhTfrapn1ykzC7jvzim4nK2iMHs4y qarKAte43PaCneaJw2R0zcduZf+1oVHFO/bh3GwPxi8AV177/G6iWhJjomRXXIjYGlVJ wxZh8Y4Tx9AbhrVHkKgwICIfy3t+LapMGv6yLEX/xBQ5nnNtQQnZ+HQqNtjkePewJdj9 sBmRHRGbVqKW6P38wOnsVS8IvtDuTciJilVjKXzLGLIw7tF4v8lm+NSCcqvVyDx8RIke 5ryQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:dkim-signature:arc-authentication-results; bh=XPCMSWzFwBTc8M2SqALypNqn0Eu/MqrPq+PzLoXH59c=; b=H4aVdY+z2x1Ci2wvMYAvIynHG6aS8Zc6tzUxlSkOIQT0tIvkruYOztSrknhvURa9xD iKi2jpdQjTX+sMOS8dT67G3j2oTDXiXJF0fKZCDTxPK9jgpWnpRtthnT5VG2IwMisf4A t7KA/mYmEMSDAw/AMZmT0V1z6B8z0U6/w3ogfjcLfPkD0IwsMaCxyJbAJqZVq/YwyvDA qbqdCfn9TiACXi/d+t3AtPaMCcVONMw4+XFNeU00j/ZvbZy/YfnLN7YY1QHBOAaK6pKH uNxmN2FVB2tPAhkI+oQWyGxYC7Qr+bNayFAoOETpt/oTfAa4nWpK7RQE+O03Yc479QT3 RcBA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=UdxGkaxh; spf=pass (google.com: domain of srs0=ywzk=ib=linuxfoundation.org=gregkh@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=SRS0=ywzk=IB=linuxfoundation.org=gregkh@kernel.org Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=UdxGkaxh; spf=pass (google.com: domain of srs0=ywzk=ib=linuxfoundation.org=gregkh@kernel.org designates 198.145.29.99 as permitted sender) smtp.mailfrom=SRS0=ywzk=IB=linuxfoundation.org=gregkh@kernel.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Eric Dumazet , syzbot , "David S. Miller" Subject: [PATCH 4.4 33/56] netlink: fix uninit-value in netlink_sendmsg Date: Mon, 14 May 2018 08:48:38 +0200 Message-Id: <20180514064758.013163764@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180514064754.853201981@linuxfoundation.org> References: <20180514064754.853201981@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1600421231527145500?= X-GMAIL-MSGID: =?utf-8?q?1600421406841446218?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Eric Dumazet commit 6091f09c2f79730d895149bcfe3d66140288cd0e upstream. syzbot reported : BUG: KMSAN: uninit-value in ffs arch/x86/include/asm/bitops.h:432 [inline] BUG: KMSAN: uninit-value in netlink_sendmsg+0xb26/0x1310 net/netlink/af_netlink.c:1851 Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Eric Dumazet Reported-by: syzbot Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/netlink/af_netlink.c | 2 ++ 1 file changed, 2 insertions(+) --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -1795,6 +1795,8 @@ static int netlink_sendmsg(struct socket if (msg->msg_namelen) { err = -EINVAL; + if (msg->msg_namelen < sizeof(struct sockaddr_nl)) + goto out; if (addr->nl_family != AF_NETLINK) goto out; dst_portid = addr->nl_pid;