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=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 C999DC388F9 for ; Tue, 3 Nov 2020 21:04:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 860F5206B5 for ; Tue, 3 Nov 2020 21:04:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604437488; bh=TFjh0sAIslQkKxg1R6R4R3LdqE9rg+jVnb4eMRp5rdw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=DP9qnkzD+TqHNPYIrPig49Yfq+paOWVsvmMPQK8JBg3bN5oFAGMgBz0HY1pKlThBq qeNKYAdGSFRU6houu8szvQF7ORIR0iqSTnvIOMHX32QHteKrUf/ATFQ4iPhqbwA3gT tRhgE8a/00NgR9MJ5zvTYMT4xjapNCjFfUcR1YRE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388024AbgKCVEr (ORCPT ); Tue, 3 Nov 2020 16:04:47 -0500 Received: from mail.kernel.org ([198.145.29.99]:42950 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388025AbgKCVEq (ORCPT ); Tue, 3 Nov 2020 16:04:46 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B6E9F20658; Tue, 3 Nov 2020 21:04:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604437486; bh=TFjh0sAIslQkKxg1R6R4R3LdqE9rg+jVnb4eMRp5rdw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qriT3jKUBp5YrNSsHfEFmJfm/a13QO2t6gdRMcDGHmsBGPCm3POGgtk9nF2t+WzSL fha1y+iWHmXVVgTlKgMEqPia9q/ldKYItSxPPcc2r8iBZTM1PnL+vyYZXz0gk9+l1x ypD45/i7WrgCFoyyqleBGH3tJiJDu/Rk6uwahlIU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+75d51fe5bf4ebe988518@syzkaller.appspotmail.com, Anant Thazhemadam , Dominique Martinet , Sasha Levin Subject: [PATCH 4.19 098/191] net: 9p: initialize sun_server.sun_path to have addrs value only when addr is valid Date: Tue, 3 Nov 2020 21:36:30 +0100 Message-Id: <20201103203242.956970230@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201103203232.656475008@linuxfoundation.org> References: <20201103203232.656475008@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@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) { -- 2.27.0