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=-16.1 required=3.0 tests=BAYES_00,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=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 DBE3FC43463 for ; Fri, 18 Sep 2020 02:19:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AC14123772 for ; Fri, 18 Sep 2020 02:19:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600395564; bh=nYibujcRQpsv8CCI/+pEmS6ylsTI/XAJNTHgYKHpAu8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=SszJBham0dVB0YMn+hL2SGW8ekozGNzNTs7iQxuM9g0Jvga7TG+cefuC4OEBDbZLL 0jEzRSfg4fEtleUXfvyvA6Fh/MX+NazrD2qaXDHGoTWtLGVNbM8FGT8Jt4i4GEIxOo xPGRnn/RQqzZFNOjw4gQazg+U+1NzFxHmUKUcZDc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729704AbgIRCTX (ORCPT ); Thu, 17 Sep 2020 22:19:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:48584 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729562AbgIRCRm (ORCPT ); Thu, 17 Sep 2020 22:17:42 -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 BDCEC239D2; Fri, 18 Sep 2020 02:17:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600395461; bh=nYibujcRQpsv8CCI/+pEmS6ylsTI/XAJNTHgYKHpAu8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wHsxZG82/LNvoTrxphP+kF5vSK2Zr+sVJmZsr9YOJLYCYjRsyQiBRJPqpGGTC43CT RDI3vrJg3Y+Bstn5LNTFYBtBuSVRkxp+S2L2t/y0wPswP9l/WRfWlltmp/NDhpVKmj FJXbwhhvL6tQaVj9BEZdY0smZMMEab/FBdxRiG38= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Cong Wang , Gengming Liu , "David S . Miller" , Sasha Levin , netdev@vger.kernel.org Subject: [PATCH AUTOSEL 4.4 47/64] atm: fix a memory leak of vcc->user_back Date: Thu, 17 Sep 2020 22:16:26 -0400 Message-Id: <20200918021643.2067895-47-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200918021643.2067895-1-sashal@kernel.org> References: <20200918021643.2067895-1-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: Cong Wang [ Upstream commit 8d9f73c0ad2f20e9fed5380de0a3097825859d03 ] In lec_arp_clear_vccs() only entry->vcc is freed, but vcc could be installed on entry->recv_vcc too in lec_vcc_added(). This fixes the following memory leak: unreferenced object 0xffff8880d9266b90 (size 16): comm "atm2", pid 425, jiffies 4294907980 (age 23.488s) hex dump (first 16 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 6b 6b 6b a5 ............kkk. backtrace: [<(____ptrval____)>] kmem_cache_alloc_trace+0x10e/0x151 [<(____ptrval____)>] lane_ioctl+0x4b3/0x569 [<(____ptrval____)>] do_vcc_ioctl+0x1ea/0x236 [<(____ptrval____)>] svc_ioctl+0x17d/0x198 [<(____ptrval____)>] sock_do_ioctl+0x47/0x12f [<(____ptrval____)>] sock_ioctl+0x2f9/0x322 [<(____ptrval____)>] vfs_ioctl+0x1e/0x2b [<(____ptrval____)>] ksys_ioctl+0x61/0x80 [<(____ptrval____)>] __x64_sys_ioctl+0x16/0x19 [<(____ptrval____)>] do_syscall_64+0x57/0x65 [<(____ptrval____)>] entry_SYSCALL_64_after_hwframe+0x49/0xb3 Cc: Gengming Liu Signed-off-by: Cong Wang Signed-off-by: David S. Miller Signed-off-by: Sasha Levin --- net/atm/lec.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/atm/lec.c b/net/atm/lec.c index e4afac94ff158..a38680e194436 100644 --- a/net/atm/lec.c +++ b/net/atm/lec.c @@ -1290,6 +1290,12 @@ static void lec_arp_clear_vccs(struct lec_arp_table *entry) entry->vcc = NULL; } if (entry->recv_vcc) { + struct atm_vcc *vcc = entry->recv_vcc; + struct lec_vcc_priv *vpriv = LEC_VCC_PRIV(vcc); + + kfree(vpriv); + vcc->user_back = NULL; + entry->recv_vcc->push = entry->old_recv_push; vcc_release_async(entry->recv_vcc, -EPIPE); entry->recv_vcc = NULL; -- 2.25.1