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=-0.4 required=3.0 tests=FROM_LOCAL_DIGITS, FROM_LOCAL_HEX,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, URIBL_BLOCKED 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 0E19FC0044C for ; Thu, 1 Nov 2018 14:33:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D3303205F4 for ; Thu, 1 Nov 2018 14:33:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D3303205F4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728855AbeKAXgR (ORCPT ); Thu, 1 Nov 2018 19:36:17 -0400 Received: from mail-io1-f72.google.com ([209.85.166.72]:34836 "EHLO mail-io1-f72.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728563AbeKAXgQ (ORCPT ); Thu, 1 Nov 2018 19:36:16 -0400 Received: by mail-io1-f72.google.com with SMTP id w13-v6so17826585iop.2 for ; Thu, 01 Nov 2018 07:33:03 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=hQIyUSitTBs39SdG09Ky3Woh/1dCFuu0jzk4P4YQzek=; b=MUrkoMKrrQ7KF/j4pNA/hHylhUGIO8dGQplxyvVgAZWuPUaudgsI0yxo2WfHirvBuL 2xtlu9C/TDjnAp6vEiPyAFSyW/4f7R2tOqjT8W9xP26wGxBEF2w8PF99K6oP80d8VQ7l RzHJUqn2muugH5dRlEJbEIEN6woMvYtrTnHys9MqeAzULBxqVxDQS+rYRDT4MPWQKzzW I2jq496bITir1Wo4UVoVLYqWHbEy2IUhqHB4Vh7YP4yL8xf4hUdWOXKBWobWCltuGnwP xNt4LiUrPCq0DvIHXjgh6234DerpOYT+j8dNqLGQZMDz6RvfysZlSZeUvw9tqXcQHaeM HR9Q== X-Gm-Message-State: AGRZ1gLKl8XNLE3SmZZVs2uTIKmlTy132bxpnLO73k9txhX9CzrAvHBJ wFzfEzQJ6YknNmdL4hi1uhGwAdCT24nIy9RRADLcLZ1MpyAh X-Google-Smtp-Source: AJdET5fFQG4vwEVECbOMg7Xa/pAdzTR03hRf+nDJhtWUhIDzIzztsuxuHbxGMOjKhNJoPjwRqLbiCry7WsD8CjcCgINJNsRs3Laq MIME-Version: 1.0 X-Received: by 2002:a24:b64a:: with SMTP id d10-v6mr1544631itj.27.1541082782663; Thu, 01 Nov 2018 07:33:02 -0700 (PDT) Date: Thu, 01 Nov 2018 07:33:02 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000d4940a05799b4b72@google.com> Subject: KASAN: use-after-free Read in ucma_event_handler From: syzbot To: dledford@redhat.com, jgg@ziepe.ca, leon@kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, parav@mellanox.com, roland@purestorage.com, swise@opengridcomputing.com, syzkaller-bugs@googlegroups.com, xiyou.wangcong@gmail.com Content-Type: text/plain; charset="UTF-8"; format=flowed; delsp=yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: 11743c56785c Merge tag 'rpmsg-v4.20' of git://github.com/a.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=166b07cb400000 kernel config: https://syzkaller.appspot.com/x/.config?x=93932074d01b4a5 dashboard link: https://syzkaller.appspot.com/bug?extid=f3f3a1734458129344f5 compiler: gcc (GCC) 8.0.1 20180413 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+f3f3a1734458129344f5@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in __mutex_lock_common kernel/locking/mutex.c:1009 [inline] BUG: KASAN: use-after-free in __mutex_lock+0x1601/0x16f0 kernel/locking/mutex.c:1072 Read of size 8 at addr ffff8801c1918188 by task kworker/u4:1/21 CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 4.19.0+ #88 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: ib_addr process_one_req Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __mutex_lock_common kernel/locking/mutex.c:1009 [inline] __mutex_lock+0x1601/0x16f0 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 ucma_event_handler+0x116/0x1000 drivers/infiniband/core/ucma.c:354 addr_handler+0x305/0x420 drivers/infiniband/core/cma.c:2991 process_one_req+0x1a9/0x920 drivers/infiniband/core/addr.c:643 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:350 Allocated by task 13266: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620 kmalloc include/linux/slab.h:546 [inline] ucma_open+0xb5/0x3f0 drivers/infiniband/core/ucma.c:1721 misc_open+0x3ca/0x560 drivers/char/misc.c:141 chrdev_open+0x25a/0x710 fs/char_dev.c:417 do_dentry_open+0x499/0x1250 fs/open.c:771 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x12bc/0x5150 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 __do_sys_openat fs/open.c:1090 [inline] __se_sys_openat fs/open.c:1084 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1084 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 13265: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 ucma_close+0x27e/0x310 drivers/infiniband/core/ucma.c:1780 __fput+0x385/0xa30 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801c1918140 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 72 bytes inside of 256-byte region [ffff8801c1918140, ffff8801c1918240) The buggy address belongs to the page: page:ffffea0007064600 count:1 mapcount:0 mapping:ffff8801da8007c0 index:0xffff8801c1918640 flags: 0x2fffc0000000200(slab) raw: 02fffc0000000200 ffffea000707bd88 ffffea0007498608 ffff8801da8007c0 raw: ffff8801c1918640 ffff8801c1918000 0000000100000005 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c1918080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801c1918100: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb > ffff8801c1918180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8801c1918200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8801c1918280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot.