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=-5.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS 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 06AC9C433DF for ; Tue, 2 Jun 2020 05:03:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CE590206C3 for ; Tue, 2 Jun 2020 05:03:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="nApo+80g" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726683AbgFBFDT (ORCPT ); Tue, 2 Jun 2020 01:03:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56224 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725890AbgFBFDS (ORCPT ); Tue, 2 Jun 2020 01:03:18 -0400 Received: from mail-lj1-x243.google.com (mail-lj1-x243.google.com [IPv6:2a00:1450:4864:20::243]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2ED7FC061A0E; Mon, 1 Jun 2020 22:03:18 -0700 (PDT) Received: by mail-lj1-x243.google.com with SMTP id n23so203133ljh.7; Mon, 01 Jun 2020 22:03:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to:cc; bh=8QQzF6XIiPRpUJoXQeMmrlURiCVGEwgv/4YD02PeuX8=; b=nApo+80geSDN+ByG5z6cPNjFurqx7tudzrAoX6J5V7bcaYdbd9i9Xrmz+SdX4XHZWz 6l3WLJ6fs9lS4RpF+E7Z9wTced8AOJ3GvshjofW5UdQW/CktX+SKuPTjYaBXkkp7llUK KsU6Z4YH3VICyfhJ52kNdGT/iXDHOCf3munKaPbG9O0I3P3pgLri1RVVxXX8eec0eL98 7zOziHL0N73h/MdsM8+w8SzWtCkejiazpDVImU3XK1X/YNFwi8qXrk2yjANONjOprLnT Zylo31EqOpGX0YQhlrGKQ+iWDMz0fPm3WdY2tZNYb2JSIJPmz5np7eIqV1uXA+MkUjOy CTHw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to:cc; bh=8QQzF6XIiPRpUJoXQeMmrlURiCVGEwgv/4YD02PeuX8=; b=iLhvlXx9NQHFvIvup/csd46XwDTXJjtkbVFHXyhMXBhH4VPL8QLBo7Ql34XEhLa9wF Lc05a/IkGNFo4khFvgyu1BCfter+21mgU3xRbPk6jq8kFEb5q0XMq+quFKmakf7AF/Hw H6bJBgniwlP3D5H2fAE/tOmHO0nl0QD1G4mwccqQLAAjyBLytnAML6g/SCE/L0VrXbex zYqwTFUh0741BWenKwOcbLgRVmZmsfBlathU3rBOwWMxAv2qbXXqsrZKY21aabnT3KiW z83j/nn3oZER0y2O8DGdS7mBUhfpI6bK0VDB+16xqOkdibNFjAuYLiVJ2MtE/ldXVUOA 0DLw== X-Gm-Message-State: AOAM531wj4L2/EcWTsGzdUd+MiNiTfhmfVEz7vna33/IvCITfF1ci1Q8 4rseyqhmyug1FYX2jh+y6Qh2wpjAoZwu31RB4eo9J6FhQcs= X-Google-Smtp-Source: ABdhPJwmCdnzeqKLpf9U2YYQ95O2iAC3SnSKcMlolf3vqQ0bMp2Cr6AlgaAAI/ze/2Xs8LnfCdKLsgMZkcAdTy5xeeo= X-Received: by 2002:a05:651c:545:: with SMTP id q5mr12417458ljp.57.1591074196664; Mon, 01 Jun 2020 22:03:16 -0700 (PDT) MIME-Version: 1.0 From: butt3rflyh4ck Date: Tue, 2 Jun 2020 13:03:05 +0800 Message-ID: Subject: memory leak in exfat_parse_param To: namjae.jeon@samsung.com, sj1557.seo@samsung.com Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I report a bug (in linux-5.7.0-rc7) found by syzkaller. kernel config: https://github.com/butterflyhack/syzkaller-fuzz/blob/master/config-v5.7.0-rc7 and can reproduce. A param->string held by exfat_mount_options. BUG: memory leak unreferenced object 0xffff88801972e090 (size 8): comm "syz-executor.2", pid 16298, jiffies 4295172466 (age 14.060s) hex dump (first 8 bytes): 6b 6f 69 38 2d 75 00 00 koi8-u.. backtrace: [<000000005bfe35d6>] kstrdup+0x36/0x70 mm/util.c:60 [<0000000018ed3277>] exfat_parse_param+0x160/0x5e0 fs/exfat/super.c:276 [<000000007680462b>] vfs_parse_fs_param+0x2b4/0x610 fs/fs_context.c:147 [<0000000097c027f2>] vfs_parse_fs_string+0xe6/0x150 fs/fs_context.c:191 [<00000000371bf78f>] generic_parse_monolithic+0x16f/0x1f0 fs/fs_context.c:231 [<000000005ce5eb1b>] do_new_mount fs/namespace.c:2812 [inline] [<000000005ce5eb1b>] do_mount+0x12bb/0x1b30 fs/namespace.c:3141 [<00000000b642040c>] __do_sys_mount fs/namespace.c:3350 [inline] [<00000000b642040c>] __se_sys_mount fs/namespace.c:3327 [inline] [<00000000b642040c>] __x64_sys_mount+0x18f/0x230 fs/namespace.c:3327 [<000000003b024e98>] do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 [<00000000ce2b698c>] entry_SYSCALL_64_after_hwframe+0x49/0xb3