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=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,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 14F64C11F82 for ; Tue, 6 Jul 2021 12:02:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 002F4620DD for ; Tue, 6 Jul 2021 12:02:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243415AbhGFMDb (ORCPT ); Tue, 6 Jul 2021 08:03:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:47548 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237318AbhGFLgF (ORCPT ); Tue, 6 Jul 2021 07:36:05 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id ABD7161EF2; Tue, 6 Jul 2021 11:26:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625570812; bh=QxMsqh2Dtak9GW1fH42izSg9EdwGEWoPHdlqZYEFBgo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aVFgJuf+jC3dTLDEcnuSgXP/jALDykOWxrVCRsfU3AweBNfyaXklbotuwOCKqX30G AMbdGPv798ebCBRbnzn0v9JiGhgaSy+lfLP1etRsdU8JJ3UP6GTQBzLEpyY/MYkTSr 1lWqA4newI7DePQaJw3EBtu5OdOkqJSH/CGadLVIZQjASimMw0x8vdpmake1SXEah/ ONNNOJPg5i1u9MKhbTzp6yhnemKFxEctkCTYuL5Sozv0NwPraW0XN578GQrIwTmhLw +ebE+9r+K3rRftsWczLWxih8grenTwJM5C0pn6hAs6RNwISidgEXRzLcF/ukpv3U9Q vYZLFLdwIn6CQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zou Wei , Hulk Robot , "David S . Miller" , Sasha Levin , linux-atm-general@lists.sourceforge.net, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 10/55] atm: nicstar: Fix possible use-after-free in nicstar_cleanup() Date: Tue, 6 Jul 2021 07:25:53 -0400 Message-Id: <20210706112638.2065023-10-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210706112638.2065023-1-sashal@kernel.org> References: <20210706112638.2065023-1-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: Zou Wei [ Upstream commit 34e7434ba4e97f4b85c1423a59b2922ba7dff2ea ] This module's remove path calls del_timer(). However, that function does not wait until the timer handler finishes. This means that the timer handler may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling del_timer_sync(), which makes sure the timer handler has finished, and unable to re-schedule itself. Reported-by: Hulk Robot Signed-off-by: Zou Wei Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- drivers/atm/nicstar.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/atm/nicstar.c b/drivers/atm/nicstar.c index 0d3754a4ac20..5281db3d6783 100644 --- a/drivers/atm/nicstar.c +++ b/drivers/atm/nicstar.c @@ -296,7 +296,7 @@ static void __exit nicstar_cleanup(void) { XPRINTK("nicstar: nicstar_cleanup() called.\n"); - del_timer(&ns_timer); + del_timer_sync(&ns_timer); pci_unregister_driver(&nicstar_driver); -- 2.30.2