From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 45AB6C2D0A3 for ; Tue, 27 Oct 2020 00:09:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0957020754 for ; Tue, 27 Oct 2020 00:09:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603757369; bh=Qm9Xxfq0UUvYYgPkZge6d+u6iGS2l+y3Or//7tNyrCw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=DAuolC0N3zDabN8Sa0UlWSfWhzaK3L0LZCiGiNwEji/EcVCuQI4/rON47z3/fNz+V EZpzoCcJv3X4pIrEGF5rK5tr2PNl9yAGBq+YKV1WUbKbR5hvWtnVDbbmkQ9FQ3N2DE DC9+wOhNa3qGEqy/byBKsOit3IM9PfqvMSrNpjo0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2394579AbgJ0AHP (ORCPT ); Mon, 26 Oct 2020 20:07:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:54066 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2438162AbgJ0AFL (ORCPT ); Mon, 26 Oct 2020 20:05:11 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 521B321707; Tue, 27 Oct 2020 00:05:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603757111; bh=Qm9Xxfq0UUvYYgPkZge6d+u6iGS2l+y3Or//7tNyrCw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=l4IyaumnjKllyr+f+V/mb13kj6tdOC2PqJ7U129YecWt19MrzWVhTjPXKCrv/ouIk ljhu0CrV9O3+2VIAEyoPZYhJAszlkz+EpgNcCvUC2p2TE+dqJfr6vmybHgL9HkrZK+ EiKZRxEwda9/a3/SSXMyVcCk2igfmBT4EtMEx5q8= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Anant Thazhemadam , syzbot+75d51fe5bf4ebe988518@syzkaller.appspotmail.com, Dominique Martinet , Sasha Levin , v9fs-developer@lists.sourceforge.net, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 47/60] net: 9p: initialize sun_server.sun_path to have addr's value only when addr is valid Date: Mon, 26 Oct 2020 20:04:02 -0400 Message-Id: <20201027000415.1026364-47-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201027000415.1026364-1-sashal@kernel.org> References: <20201027000415.1026364-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Anant Thazhemadam [ Upstream commit 7ca1db21ef8e0e6725b4d25deed1ca196f7efb28 ] In p9_fd_create_unix, checking is performed to see if the addr (passed as an argument) is NULL or not. However, no check is performed to see if addr is a valid address, i.e., it doesn't entirely consist of only 0's. The initialization of sun_server.sun_path to be equal to this faulty addr value leads to an uninitialized variable, as detected by KMSAN. Checking for this (faulty addr) and returning a negative error number appropriately, resolves this issue. Link: http://lkml.kernel.org/r/20201012042404.2508-1-anant.thazhemadam@gmail.com Reported-by: syzbot+75d51fe5bf4ebe988518@syzkaller.appspotmail.com Tested-by: syzbot+75d51fe5bf4ebe988518@syzkaller.appspotmail.com Signed-off-by: Anant Thazhemadam Signed-off-by: Dominique Martinet Signed-off-by: Sasha Levin --- net/9p/trans_fd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c index b6dcb40fa8a7d..9268f808afc08 100644 --- a/net/9p/trans_fd.c +++ b/net/9p/trans_fd.c @@ -1038,7 +1038,7 @@ p9_fd_create_unix(struct p9_client *client, const char *addr, char *args) csocket = NULL; - if (addr == NULL) + if (!addr || !strlen(addr)) return -EINVAL; if (strlen(addr) >= UNIX_PATH_MAX) { -- 2.25.1