From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753451AbdLGRlw (ORCPT ); Thu, 7 Dec 2017 12:41:52 -0500 Received: from omzsmtpe02.verizonbusiness.com ([199.249.25.209]:16364 "EHLO omzsmtpe02.verizonbusiness.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755610AbdLGPto (ORCPT ); Thu, 7 Dec 2017 10:49:44 -0500 From: alexander.levin@verizon.com Cc: Alexander Potapenko , "David S . Miller" , alexander.levin@verizon.com X-Host: endeavour.tdc.vzwcorp.com To: "linux-kernel@vger.kernel.org" , "stable@vger.kernel.org" Subject: [PATCH AUTOSEL for 4.9 007/156] net: initialize msg.msg_flags in recvfrom Thread-Topic: [PATCH AUTOSEL for 4.9 007/156] net: initialize msg.msg_flags in recvfrom Thread-Index: AQHTb3LjJRFcEvrLikiDeqzq2LyQww== Date: Thu, 7 Dec 2017 15:48:55 +0000 Message-ID: <20171207154845.4814-7-alexander.levin@verizon.com> References: <20171207154845.4814-1-alexander.levin@verizon.com> In-Reply-To: <20171207154845.4814-1-alexander.levin@verizon.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.144.60.250] Content-Type: text/plain; charset="iso-8859-1" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by nfs id vB7HfuR9001107 From: Alexander Potapenko [ Upstream commit 9f138fa609c47403374a862a08a41394be53d461 ] KMSAN reports a use of uninitialized memory in put_cmsg() because msg.msg_flags in recvfrom haven't been initialized properly. The flag values don't affect the result on this path, but it's still a good idea to initialize them explicitly. Signed-off-by: Alexander Potapenko Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/socket.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/socket.c b/net/socket.c index 6bbccf05854f..05f13b24572c 100644 --- a/net/socket.c +++ b/net/socket.c @@ -1702,6 +1702,7 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size, /* We assume all kernel code knows the size of sockaddr_storage */ msg.msg_namelen = 0; msg.msg_iocb = NULL; + msg.msg_flags = 0; if (sock->file->f_flags & O_NONBLOCK) flags |= MSG_DONTWAIT; err = sock_recvmsg(sock, &msg, flags); -- 2.11.0