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=-9.0 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,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 6B454C282DD for ; Thu, 23 May 2019 19:10:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 44087217D9 for ; Thu, 23 May 2019 19:10:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558638608; bh=vpp/1jvOvk7EC5ZgYj32HlkGdixLiQpHnrgPXUKWzDU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=rO2xHKY2IhAjQcdkLhvh/yRDshCqgX5voaugms+ZD1dwQeQl09sqHr+DkKCI2Jr3K F41IsZ5YSrQ6labKPdo3VNcN8ZSIqfEQtLzgQJzJdGmDDTZkQI/DUYUUV8L9PL2zyT E+6O7jI8UCfoUuyjOOj/iD+HjiYMBfiF8yrFJpcY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387694AbfEWTKH (ORCPT ); Thu, 23 May 2019 15:10:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:43396 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387650AbfEWTKF (ORCPT ); Thu, 23 May 2019 15:10:05 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 DF6D92133D; Thu, 23 May 2019 19:10:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558638605; bh=vpp/1jvOvk7EC5ZgYj32HlkGdixLiQpHnrgPXUKWzDU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mH2rG4v6U8wGczzH2bCMefw6NbCM2eqR0tW2TIjLN9s+WEIVJxc+AAs0z7uaGu9RW uQtp1COnBeHGV+5qX3rIDSKYUFtTaeJ/ZrXEE5NzFq1MhJNZ+d/RyJpuPU+0a9j+Kf sP6Jx3UDoAJbItTyAg3TqmV2nhwltcRZaU6XX+AY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Su Yanjun , Herbert Xu , Steffen Klassert , Sasha Levin Subject: [PATCH 4.9 43/53] xfrm6_tunnel: Fix potential panic when unloading xfrm6_tunnel module Date: Thu, 23 May 2019 21:06:07 +0200 Message-Id: <20190523181717.800776441@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190523181710.981455400@linuxfoundation.org> References: <20190523181710.981455400@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit 6ee02a54ef990a71bf542b6f0a4e3321de9d9c66 ] When unloading xfrm6_tunnel module, xfrm6_tunnel_fini directly frees the xfrm6_tunnel_spi_kmem. Maybe someone has gotten the xfrm6_tunnel_spi, so need to wait it. Fixes: 91cc3bb0b04ff("xfrm6_tunnel: RCU conversion") Signed-off-by: Su Yanjun Acked-by: Herbert Xu Signed-off-by: Steffen Klassert Signed-off-by: Sasha Levin --- net/ipv6/xfrm6_tunnel.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/net/ipv6/xfrm6_tunnel.c b/net/ipv6/xfrm6_tunnel.c index 3a2701d42f471..07b7b2540579c 100644 --- a/net/ipv6/xfrm6_tunnel.c +++ b/net/ipv6/xfrm6_tunnel.c @@ -391,6 +391,10 @@ static void __exit xfrm6_tunnel_fini(void) xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6); xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6); unregister_pernet_subsys(&xfrm6_tunnel_net_ops); + /* Someone maybe has gotten the xfrm6_tunnel_spi. + * So need to wait it. + */ + rcu_barrier(); kmem_cache_destroy(xfrm6_tunnel_spi_kmem); } -- 2.20.1