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=-9.1 required=3.0 tests=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=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 F17E3C04AAF for ; Thu, 16 May 2019 11:43:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AEB3E20862 for ; Thu, 16 May 2019 11:43:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558006996; bh=5QHq0NPx/pf/I7hk4JXiWuDDQ4q1QHLuvyeWrpEjm/0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=PhR72COmINMyMgCMDSRs6UeXOfO4L8g4j6aZE9Po655pF/OuxmTy+zKsTvp9WIhsG usdGHYTmgvIkKxu+gXzzfjMOmPWlydYKzBLghj909/L7I4UOyxtEYRtizkKr8kdz+t X1E+k8m86VcYlEdAyK9NWWmLGJ1Vd/VjqRK4thB8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728563AbfEPLnP (ORCPT ); Thu, 16 May 2019 07:43:15 -0400 Received: from mail.kernel.org ([198.145.29.99]:50634 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727580AbfEPLlu (ORCPT ); Thu, 16 May 2019 07:41:50 -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 49C9A20848; Thu, 16 May 2019 11:41:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1558006910; bh=5QHq0NPx/pf/I7hk4JXiWuDDQ4q1QHLuvyeWrpEjm/0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kskqooDLhWUveogBtJegOV6GuIYC3+sXSOPsqtTkhwKhgPEy8+lJWcpdsg0Jrgym0 riuQAQcOi+1bNgH3Ak2JvucVYSGVfD1ZEuwkrKys48vWI1Z37MhBr8KqyDGUunkuG3 WZhnJpHH9iD4YR991zGZt4snRIZ4Gw88wpbhajYk= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Su Yanjun , Herbert Xu , Steffen Klassert , Sasha Levin , netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 2/8] xfrm6_tunnel: Fix potential panic when unloading xfrm6_tunnel module Date: Thu, 16 May 2019 07:41:40 -0400 Message-Id: <20190516114146.9267-2-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190516114146.9267-1-sashal@kernel.org> References: <20190516114146.9267-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Su Yanjun [ 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 56b72cada346f..f9d493c59d6c1 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