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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, 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 52FF9C33CA9 for ; Tue, 14 Jan 2020 05:43:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2ED302075B for ; Tue, 14 Jan 2020 05:43:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727556AbgANFne (ORCPT ); Tue, 14 Jan 2020 00:43:34 -0500 Received: from mail.windriver.com ([147.11.1.11]:52178 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725820AbgANFnd (ORCPT ); Tue, 14 Jan 2020 00:43:33 -0500 Received: from ALA-HCB.corp.ad.wrs.com (ala-hcb.corp.ad.wrs.com [147.11.189.41]) by mail.windriver.com (8.15.2/8.15.2) with ESMTPS id 00E5hETX001368 (version=TLSv1 cipher=AES256-SHA bits=256 verify=FAIL); Mon, 13 Jan 2020 21:43:14 -0800 (PST) Received: from pek-qwang2-d1.wrs.com (128.224.162.199) by ALA-HCB.corp.ad.wrs.com (147.11.189.41) with Microsoft SMTP Server id 14.3.468.0; Mon, 13 Jan 2020 21:43:13 -0800 From: To: , CC: , , Subject: [PATCH] ubifs: fix memory leak from c->sup_node Date: Tue, 14 Jan 2020 13:43:11 +0800 Message-ID: <20200114054311.8984-1-quanyang.wang@windriver.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Quanyang Wang The c->sup_node is allocated in function ubifs_read_sb_node but is not freed. This will cause memory leak as below: unreferenced object 0xbc9ce000 (size 4096): comm "mount", pid 500, jiffies 4294952946 (age 315.820s) hex dump (first 32 bytes): 31 18 10 06 06 7b f1 11 02 00 00 00 00 00 00 00 1....{.......... 00 10 00 00 06 00 00 00 00 00 00 00 08 00 00 00 ................ backtrace: [] ubifs_read_superblock+0x48/0xebc [] ubifs_mount+0x974/0x1420 [<8589ecc3>] legacy_get_tree+0x2c/0x50 [<5f1fb889>] vfs_get_tree+0x28/0xfc [] do_mount+0x4f8/0x748 [<4151f538>] ksys_mount+0x78/0xa0 [] ret_fast_syscall+0x0/0x54 [<1cc40005>] 0x7ea02790 Free it in ubifs_umount and in the error path of mount_ubifs. Fixes: fd6150051bec ("ubifs: Store read superblock node") Signed-off-by: Quanyang Wang --- fs/ubifs/super.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index 7d4547e5202d..a4412c259bb3 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -1599,6 +1599,7 @@ static int mount_ubifs(struct ubifs_info *c) vfree(c->ileb_buf); vfree(c->sbuf); kfree(c->bottom_up_buf); + kfree(c->sup_node); ubifs_debugging_exit(c); return err; } @@ -1641,6 +1642,7 @@ static void ubifs_umount(struct ubifs_info *c) vfree(c->ileb_buf); vfree(c->sbuf); kfree(c->bottom_up_buf); + kfree(c->sup_node); ubifs_debugging_exit(c); } -- 2.17.1