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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,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 D3B88C07E9E for ; Mon, 12 Jul 2021 07:50:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B928E61164 for ; Mon, 12 Jul 2021 07:50:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243300AbhGLHwt (ORCPT ); Mon, 12 Jul 2021 03:52:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:55076 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244612AbhGLHSc (ORCPT ); Mon, 12 Jul 2021 03:18:32 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 956B36147D; Mon, 12 Jul 2021 07:15:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626074137; bh=uORgVOhzNGGZCLGMKlrf9wbnUnEkU696nU2JeLpdqMs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fyi5yIMDb/lZgU1yzoE9AomwL1lCtUzKZ6D/jyedYNwhTia+K6GLxQUY36KlQXTLk 7fjwfImRTfuqJVUGq5/o9YNUNZZcCbrEM0fpj46E1MBFSqVL9ZE9avRSTDkkDLhX2G +5eostgf4ldgRkEqUmX0gQ6+EO/ftW7EmdD7bT3c= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Norbert Slusarek , Oleksij Rempel , Marc Kleine-Budde , Sasha Levin Subject: [PATCH 5.12 476/700] can: j1939: j1939_sk_setsockopt(): prevent allocation of j1939 filter for optlen == 0 Date: Mon, 12 Jul 2021 08:09:19 +0200 Message-Id: <20210712061027.228023799@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060924.797321836@linuxfoundation.org> References: <20210712060924.797321836@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: linux-kernel@vger.kernel.org From: Norbert Slusarek [ Upstream commit aaf473d0100f64abc88560e2bea905805bcf2a8e ] If optval != NULL and optlen == 0 are specified for SO_J1939_FILTER in j1939_sk_setsockopt(), memdup_sockptr() will return ZERO_PTR for 0 size allocation. The new filter will be mistakenly assigned ZERO_PTR. This patch checks for optlen != 0 and filter will be assigned NULL in case of optlen == 0. Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol") Link: https://lore.kernel.org/r/20210620123842.117975-1-nslusarek@gmx.net Signed-off-by: Norbert Slusarek Acked-by: Oleksij Rempel Signed-off-by: Marc Kleine-Budde Signed-off-by: Sasha Levin --- net/can/j1939/socket.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/can/j1939/socket.c b/net/can/j1939/socket.c index fce8bc8afeb7..e1a399821238 100644 --- a/net/can/j1939/socket.c +++ b/net/can/j1939/socket.c @@ -676,7 +676,7 @@ static int j1939_sk_setsockopt(struct socket *sock, int level, int optname, switch (optname) { case SO_J1939_FILTER: - if (!sockptr_is_null(optval)) { + if (!sockptr_is_null(optval) && optlen != 0) { struct j1939_filter *f; int c; -- 2.30.2